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eBay.
2500K, 2600K, or 2700K.
IvyBridge are compatible with his board as well. And the B75 doesn't allow overclock: it's a waste of money to go "K" version, unless the OP plans on changing the board as well (which I doubt).
Is socket 1155 obsolete?
Won't get an Ivy Bridge i7 under $200.
Picked the K chip because it's the highest clocked.
Yeah but it wont be good if i cant buy a new one !
OP asked for i3 or i5...
Is socket 1155 obsolete?
100% dead as a door nail.
I disagree with some of the other people here. I think you should look into an i5 like a 3570 (no K). Look on online stores and check the buy/sell section on this forum as well.
As was mentioned, going from 1155 (Sandy/Ivy) to 1150 (Haswell) you aren't going to see any impressive clock for clock improvements. It's mainly a platform upgrade. 6 SATA 6gbps, SATA express, M.2, better VRM (on the chip itself). That's about it really. Stick with your current platform and look for a used i5. You already have PCIE 3.0 so that's good. You have everything you need there IMO.
If you're after a cheap upgrade pick up a Pentium G 3258 on sale ($60-70) and an H81 board that is a confirmed overclocker ($40-60). The chip overclocks well on the stock cooler and you should get impressive gaming performance. However, some games refuse to even launch without a 4 core CPU, and some games really truly benefit from 4 or more threads, and will struggle with a dual core. In 95% of games though, the little Pentium will fly when nicely OC'd.
No, TheOCNoob, better to go wit a 3 years old gen cpu, as soon as it has th "k" letter, with a motherboard that does not support overclocking, without PCIe-3, or any other IvyBridge feature...
I never do that future proof for 4 years time. Been at this two long even though an OC Noob.
Four years and there could be a raft of new technologies that makes your future proof obselete.
Anything top end starts about 400% above budget and in a year or two will be mid range and in four years should be turning up as budget.
I have to admit technology has slowed but a stop gap until you can do the whole ram, motherboard n processor switch might be the way to go.
Personally when we get 4 years forward we might be starting to see the death throws of wintel you just never know.