1) Aim for AM3+ motherboard. I don't know how to search it for you but you should really get AM3+ to upgrade in the future yet be able to use current AM3 CPUs.
2) You may be able to find cheaper memory from G.Skill or Mushkins. Kingstons perform fine for me as well.
3) You won't need 750W unless you plan to SLI/Crossfire. Around 400-500W will do you fine. 650W would run sli 560ti just fine. Save the money by aiming for 500-650W, that's enough to power your future upgrades.
4) See if the Samsung Spinpoint F3 1TB 7200rpm is available. That's the HDD to go for Great performance, great price!