MOBO: ??? I'm not sure. I don't ever plan on SLI, so..? I was looking at this board since it is cheap - but I really have no idea what product I might need...
GIGABYTE GA-P55M-UD2 (Link)
HSF: I would eventually get one, but since I am not OC'ng probably for a long while is it neccessary at this point? Would it be difficult to put in one, like maybe a year from now?
My eventual plans were to sit on the desktop and enjoy my casual gaming (I play games such as Bioshock 2, L4D2, Batman: AA, Battlefield: BC2). In time, I would OC and bump up the Video Card if I fell below "mid-settings" on most games. But in no way do I /always/ require max setting, I just want smooth play.
Something you may want to consider is getting an AMD build. It would save you some money, but would have slightly lower performance. However, you get a better upgrade than with the i5. If you want to look into it, I recommend the X4 955 and Gigabyte GA-770TA-UD3 for $228 after rebate.