Reddit mentions of Wiha 92191 Precision Screwdrivers 51 Pcs Master Set in Storage Tray

Nah, not going to find that in one kit unless you get Wiha's 50 piece master set.

What I've found is that buying drivers individually is often not much more expensive than buying sets, and may be cheaper if it avoids buying unneeded or duplicate drivers.

I myself have the basic drivers (PH, slotted, t10+ torx) wera and felo drivers, and use 3" bits for the more obscure stuff. I particularly like using this wera bit holding handle with 3" bits. Handles like a regular small screwdriver.

I usually buy my individual drivers from KCToolco, their search tools makes it easy to find all the different sizes you need. You can usually find them a bit cheaper on Amazon if you find all the part numbers elsewhere.

I bought this set of phillips bits, and have found them extremely useful for electronics work. Many modern electronics are assembled with screws that have PH2 heads, but are too narrow for a normal PH2 driver to fit. The set of bits I linked above includes some that are basically PH2 size but narrowed down. Really makes a big difference on preventing stripped heads.

Wiha has some nice sets that will include pretty much everything you are likely to come across with electronics repairs. Everything else can be handled with the occasional use of a bit set with whatever holder is most comfortable in your hand. Here are some kits with good bit selections from iFixit and Harbor Freight for the more budget minded.

Wiha 92191 Precision Screwdrivers 51 Pcs Master Set in Storage Tray

https://www.amazon.com/Wiha-92191-Precision-Screwdrivers-Storage/dp/B0098RB3SY

Pentalobe drivers. Spudgers. Hell, half of ifixit's catalog.

The PTT is a little outside your budget but has literally everything he'll ever need. If you gotta keep to the budget, I'd get this and this.

Not an ifixit shill and they are certainly not the level best quality out there (but definitely better than your ebay or harbor freight gear) it's more about a convenient assortment of tools that will cover a wide variety of situations for a reasonable price.

I am a Wiha tool man myself, and my screwdriver sets alone have run me several hundred dollars, but I consider that worth it.

Snap-On ratchets run around $100 each, as does a set of sockets. Going with something like a 3/8 or 1/4 80-tooth ratchet (FHL80 and F80 are two of the classic snapon designs) and an SAE and Metric set of sockets will be a GREAT gift that lasts a LONG TIME. This will sound weird, but Pawn Shops are a great place to get Snap-On stuff. I know it is strange giving a used item as a gift but it isn't uncommon because these things are such high quality. Or you can buy one part new (like the ratchet) and get a few sets of sockets from the pawn shop or visa versa. Look on ebay and local pawn shops to see what deals you can find to give him the most impressive gift possible.

For screwdrivers you can go with this Wera Kraftform Laser Tip or this, Wera Kraftform Chisel Tip or this Proto Duratek set. Now obviously, you can go smaller sets to save money or larger sets to cover more options. I have the Wera Laser Tips set that I mentioned and it is quite nice. The screwdrivers are excellent quality as I mentioned before. The Chisel Tips don't have the laser cut on the tips, but they have a MUCH harder screwdriver. They are designed to be pounded on with a HAMMER! Either of the two Wera kits covers everything you need for larger screwdrivers other than JIS screws (which are only necessary if he works on Japanese vehicles or motorcycles).

For precision Wiha makes great precision stuff. There is the classic big kit, flat version or benchtop version, which is pricey but has pretty much EVERY precision screw driver and small nut driver he could need (other than proprietary ones or security ones, but those you get on an as needed basis anyways). There is also this one, which I own. It isn't quite as nice as the previous kit, but it still is really damn nice with a very well made metal case and the quality of the tips is excellent.

A good multimeter like a Greenlee DM-510A (rebadged Brymen BM257S iirc) will do well for him (often goes on sale for around $110-130). Otherwise, a Fluke 87V will run around $150(if lucky)-$250 used on ebay in excellent condition. The Fluke 87V is the classic high-quality multimeter. A third option is the Brymen BM869S, which you can get from TME.eu in Europe for around $240. This thing is an amazing meter (it is by far my favorite meter) but Brymen doesn't have the name recognition that Fluke has so it might not be the best for a gift.

You can pick and choose from these options to maximize your gift impact. As for the design of the garage, I'm a bad example. I keep a small limited amount of quality stuff, because I move around a lot. You can snoop around on the forums at GarageJournal. You will encounter a LOT of garages that will help you get ideas in your mind. You can ask questions there as well if you are having trouble.