I chose the gigabyte as its cheaper and it has all the same functions that you would utilisebut have changed my mind Newegg.com - BIOSTAR TpowerX58 LGA 1366 Intel X58 ATX Intel Motherboard - Intel Motherboards
why its good at overclocking, its cheaper and its just as reliable with support for sli. The biostar can't do tri sli but you say that doesn't matter, however I would encourage you to as you can get tri sli if you have the funds. For $940 (after selling 4 of the spare free games for a fair price) and it will be the most powerful graphics that you can currently buy better then the gtx295 quad. It would also mean upping the psu though
The g-skill has twice as much (6gb instead of 3gb) with better timings making it faster.
They will not need additional cooling, for the cpu get the thermalright ultra-120 extreme 1366 version bit of a mouthful and it needs a 120mm fan look for one with the minimum db but the max cfm