Hmm if this is the case u are referring to http://www.newegg.com/Product/Product.aspx?Item=N82E168...
it's actually an ATX case - do u mean to have an mATX case perhaps? For those there are compact LAN party type casings which could house standard ATX form factor PSUs and mATX mobos ^^ Actually i specialize more in SFFs/mATX rigs these days
I suggest a stock build with possibly an i5 3450 and a H77 mATX board with USB/SATA 3? Stock clocks Ivy runs nice and cool Things to look out for
1. Length of PSU and so size of PSU fan could be a factor in some compact case
2. Better not to skimp on PSU and make a quality one time investment which would possibly see many a GPU upgrade? I suggest a quality 550-650W 80+ bronze PSU for single GPU configs
3. Length of GPU - just like #1
4. For OCing - height of after market HSF