Your build is pretty good across the board.
Can you provide a to where you are buying from? IMO, the Dominator's are overpriced and you would be better suited going with something else.
As for the SSD question, what do you plan to do with your PC, will help determine if cost is justified.
As for the graphics card, you are good to go with the GTX 460 1GB and you don't need extra cooling (heat sink) on a non-overclocked system.