Go with that 6000+ for sure. I would get a 790GX too like everyone else is suggesting. I like this ram tho,
http://www.newegg.com/Product/Produc...82E16820145184
No idea on how it OC's but runs great at stock and 825mhz. I recommend the Biostar 790GX TA79GX3 board.
http://www.newegg.com/Product/Produc...82E16813138129
My friend has the 100$ cheaper version and its an amazing OCer. He has a 6400+ at 3.5ghz on it. And it supports 45nm. I like that DFI 790GX but the PCIE Placements is terrible..