For SB/LGA 1155 stay away from 1.65v RAM, for AMD 4~6 cores and FX the Ripjaws, and for LGA 1155 the Corsair. Again, it depends. Further, if your OS is 64-bit then none and instead look for a 2x4GB kit if not a 4x4GB.
Q - What MOBO, CPU and OS?
Q - What's the purpose of the Build?
The H61 chipset allows only DDR3-1333 and if you edit large Photoshop files then get 4x4GB DDR3-1333 @ 1.50v. If you want to speed things up then look for CAS 8 or 7; lower CAS is faster but the overall difference is minimal. More GB of RAM is best, and I'd look at value DDR3-1333 kits.
>4GB of RAM requires 64-bit OS eg Windows 7 Home Premium 64-bit.