Reddit mentions of Sea Sonic S12G 550W ATX 550 Energy Star Certified Power Supply S12-550;SSR-550RT

If I were you, the first step I would take is to get rid of the PSU. I will come to that later.

If you are a casual gamer, then 60hz will be more than enough. The rest depends on you. You also need it for graphics, so an IPS panel is a must. Price will depend on what screen size you want.

Now coming to the important thing, discard that PSU. Don't cheap out on an important component. I will list you good PSUs with room for future upgrade from one of my recent comment. These are all good PSUs, and you can blindly choose any of them. Prices will be low if you check out local sellers. You can buy 520/550w PSU, but that is purely your choice. I suggested 650w cause you will have ample room if you decide to buy even more powerful Graphics card. Don't go for any 450w PSU.

If you are sure you might try SLI in near future, then you must get at least a minimum of 850w.

https://www.amazon.com/Corsair-RM650x-Modular-Supply-Certified/dp/B015YEIBJ8

http://www.amazon.in/Seasonic-SSR-550RT-S12G-Power-Supply/dp/B00FW6EICS

http://www.amazon.in/Seasonic-M12II-620-M12II-620-Watt-Modular/dp/B003HE260I

Or

http://www.amazon.in/Seasonic-S12II-620-BRONZE-SS-620GB/dp/B003BIEOCI

This is a bit of an overkill, but a great PSU from EVGA
http://www.amazon.in/SuperNOVA-750WSemi-Modular-Crossfire-110-B2-0750-VR/dp/B00KFAFRW6

I'd post this in /r/buildapc and add what the build is for to your post.

It's all compatible but you have an unlocked cpu and 3000 mhz RAM on a B150 board. You can't overclock the cpu on that board and your RAM will only run at 2133 mhz. I'd change it to a Z170 or Z270 instead of the B150.

I personally wouldn't use the H60 in a build that you can fit a larger cooler in. It's meant more for smaller cases where space is an issue. A $20-30 air cooler like an Cryorig H7 or M9i will actully cool better for half the price.

If this is a gaming build you're spending too much on the cpu and not enough on the video card.

I'd get this power supply. It's better quality, gold rated, and $5 less. You don't need 750W even if you do switch to a better video card.

It's been a couple of months since the cards were reviewed and by now the RX480 has caught up through driver-improvements.

I'd get this one and this PSU sorry, wrong link. I meant this one

Also maybe take a look at r/hardwareswap . Another upgrade you may want to make soon is CPU/motherboard/RAM. You're being bottlenecked pretty hard by the old i7 870 at this point.