This should be under high performance lol.
About your RAM, you choose DDR2, but AMD only supports DDR, so you have a problem there. You can get some good 2GB DDR kits for about $200-$250. Mushkin is a good brand, and so are OCZ and G.skill.
I would go with a different PSU, never heard of that brand before, especially if your gonna spend $170 on it. Go with an OCZ 520W powerstream or something.
Personally I wouldnt bother with SLI right now, terrible price: performance ratio. You will only get about a 40% increase in performance with the second card, and most current games dont even use the second card.