Buddy ... squeeze urself a bit and get a good mobo .. maybe small HDD or omit the CD/DVD drive ( if you already have one). Get good mobo .. its heart of the PC.
ya man as deepak said the 650i is your best option, u dont seem to be the guy who changes his motherboard everytime a leaf falls so better get one good and solid, besides for 1.2k more u get a hella lota option and stability to trust. think of it.