Instead of the Xeon you could get a 4690 and have an extra 100Mhz for gaming. The Xeon is more expensive for two reasons which are 1: it's a Xeon, and 2: it has multi-threading. Multi-threading might be more useful for games with DX12, but adoption of DX12 is really low right now. If you get the 4690 you will instantly save $30 and have 100 extra MHz, but will lose multi-threading. Obviously 4690K and 4790K are out because they require a Z series board to overclock and will only work in an H or B board loaded with the proper BIOS but as stated earlier, will still not over clock. You could buy a pretty nice mid range Z97 motherboard for about $120 and get a 4690K as a final option, then you would at least be able to use your DDR3 ram and even overclock. you have a lot of options, but if you're looking to save money, get the best non K Haswell processor you can buy and get maximum performance out of your current hardware.