zeyuanfu :
1, If you are going to OC, get a Z97 mobo.
2, If you do anything intensive, I'd recommend at least DDR3-1600 or 1866 RAM.
3, It's not really recommended to reuse RAM from one system to another because the RAM compatibility may vary.
4, Why not SLI/CF?
5, If you want a recommendation, I'd get the Gigabyte GA-Z97X Gaming 7. It's 170$ at Newegg.
As he wasn't sure about overclocking I assume he doesn't need an overclocking mainboard.
Some 100$ z97 mobo would suffice.
I'd definitely get z97 + k version, myself, because even if you don't overclock right now, you can still do later on. Plus, overclocking is really easy until like 4.4ghz which is a huge performance boost for almost free.