On top of the other concerns (that CPU is going to hold back the GPU (bottleneck)), what PSU do you have?
Being the computer illiterate idiot i am, i couldn't tell you. Though if you could suggest a system revamp, go for it. This coming Friday ill get around $600. so if you could put together a stable build around the graphics card i had in mind for something AROUND that range (i understand it probably wont be nearly enough).