Um im not really into intel, ive only done a few intel builds, like 6
but usually for the most part mATX boards tend not to overclock well. you may be able to do it.
As for the AIW card, the AIW stands for all in wonder, these cards were made to be used in an HTPC, which is why they have a tv tuner, I personally use mine like a TIVO , the card has RF coaxial in, and ViVo
this means you can also record things like vhs tapes to DVD's and the picture on mine is superb, (40in high def) i run mine through the DVI input on the TV.
as for the price on that gigabyte Mobo, you pay for quality.