Reddit mentions of Logitech Harmony Adapter for PlayStation 3 (Discontinued by Manufacturer)

Yes, but it's not cheap. If you use a Logitech harmony universal remote you can get this adapter;
http://www.amazon.com/Logitech-Harmony-Adapter-PlayStation-3/dp/B00267S7XW/ref=sr_1_1?ie=UTF8&qid=1341948756&sr=8-1&keywords=logitech+ps3+adapter

I have it and it works quite well, but with a tiny bit of lag. The official Sony bluetooth remote is fantastic and has great response. I have both but usually just use the Logitech Harmony to turn on and navigate Netflix and Vudu.

Here's the setup I would go with:

TV: Panasonic TCP55ST30

Blu-Ray Player: Panasonic DMP-BDT110 or Sony PS3. I've found the PS3 to be really nice because it has apps for NetFlix and a web browser for Pandora and you can stream music or video to it from any computer on the network.

AVR: Onkyo TX-NR609

Speakers: Energy 5.1 Take Classic - Not positive about that, I would do a bit more research, but for the sake of commenting, I'm picking these right now.

Remote: Logitech HarmonyOne is great. If you go with the PS3, the Adapter for PS3 is a must have, IMHO.

For the sake of saving money on wasted energy, I recommend plugging all of that into a Green Power Unit and setting the set as the master device.

You should be able to get all of this stuff for $2000 - $2500 by my estimation. Depending on the budget you may want to pay a professional a couple hundred bucks to calibrate your set once it's setup and broken in. Also, don't forget HDMI cables and speaker cable.

I personally love logitech harmony remotes, as long as you are willing to pay a bit to get it setup. I've used a Harmony ONE (the cheaper ones do essentially the same thing) since 08 or so, and it still works well. Couple that with an ir usb dongle for the pc and a ps3 adapter and it will be adaptable for many years of service

I just got a Roku, and I setup "roksbox" for it to access stored files on my computer. Organization doesn't look like it will be easy, but it was a quick way to get access to that media.

well it's only $47 right now for the adapter, and I picked one up for cheaper than that a while ago

http://www.amazon.com/Logitech-Harmony-Adapter-PlayStation-3/dp/B00267S7XW

Still pretty expensive IMO, but I really, really love the convenience of only needing one remote for everything.

A quick note now that I'm not on my phone:

Some of the sites will say it only supports 6 devices, but it got an upgrade to 8 recently. All you have to do is plug it into the My Harmony website and it will unlock to 8 devices automatically.

It also supports the PS3 bluetooth adapter, which is available on Amazon right now for $25. http://www.amazon.com/Logitech-Harmony-PlayStation-Discontinued-Manufacturer/dp/B00267S7XW/

I know you said you only need 4 devices, but I figured I'd throw that out there for future growth.

I think when I tried this, I had no luck getting it to work with the logitech PS3 adapter. Since I use my PS3 as my netflix and bluray player, I didn't get much use out of this app.

Is this app able to be used with PS3 IR adapter?

What IR receiver are you using? What software are you using?

Keep in mind that a remote control is not and should not be a replacement for a keyboard. That means your day-to-day software needs to work with a remote, but you may need to occasionally bring out a kb/mouse when you need to do something more complex (should be rare).

For example, my setup consists of a Microsoft-branded Windows Media Center IR receiver (other brands work just as well, but I've had this one since ~2005 and it still works great), a Harmony One, a Logitech diNovo Mini, and a wireless Xbox 360 controller and dongle. For day-to-day stuff, the Harmony controls everything -- Windows Media Center for TV and XBMC for everything else. When I want to play a game, I load Steam Big Picture mode from XBMC and use either the Harmony or the Xbox 360 controller to navigate to and launch the game I want to play. Obviously I use the controller in the game. When I'm done, I exit out of Steam and end up back in XBMC, where the Harmony takes over again. For the rare times when I need to do something more complex (install new software, mostly), the dinovo mini comes out just long enough to complete the task. The Harmony also flawlessly controls my Xbox 360 and PS3 (via the Bluetooth adapter).

As for range issues, how far away do you sit from your components? If they're not directly in your normal line of sight, you might want to consider replacing the Harmony One with a Harmony 900 instead (the RF version of the One).

The PDP adapter isn't the first such device. Logitech once made a Sony-licensed IR adapter for the PS3 that worked the same way the PDP gizmo does for the PS4. I had one when I owned a PS3, and it worked amazingly well.
Edit: Here's what it looked like.

For the PS3 you might need either the hub or an additional device. I had to get one for the PS4. https://www.amazon.com/Logitech-Harmony-PlayStation-Discontinued-Manufacturer/dp/B00267S7XW

I already had a Logitech Harmony, so I bought one of these and it works like a charm.

Or the ability to use an actual remote control directly with the PS4. For example, I'm using this remote for all of my devices, and it directly controls my PS3 via Bluetooth. Harmony also has a PS3 adapter. But nothing for PS4. This is what keeps me from using my PS4 for BluRay, Netflix, Amazon streaming, etc. I still use the PS3 for all of that just so I can use a normal remote instead of a game controller plus remote.

• I've been perfectly happy with my refurbished Harmony 300
  
  
• You can still get the discontinued Harmony Bluetooth Adapter for PS3 on Amazon