Well 1GB of VRAM is fine for the majority of stuff. It would only hurt you if down the road you want to go with Eyefinity or whatever, because you might have enough rendering horsepower but lack the VRAM which means at the least lowering AA, AF, and maybe texture size. Still, 1GB is pretty decent and an SSD is going to make everything seem so much snappier.
You might consider Nvidia cards as they tend to have a little more VRAM, like 1.3gb, 1.5 depending on model.
And yeah a 750 corsair is fine for most 2 card setups.