If you don't plan on OCing, that's fine. But you need to let us know if you are getting a Quad or Dual core processor.
If you aren't an enthuseist, then get a dual core. Probably the E4700 will hold over well. if you have more money, go with the E8500 processor. A little fast, and better than most (all) dual cores out there... better than mine.
2GB of 800Mhz ram is perfect. Its above standard and is a great brand. I got it too. If you're doing x64, double or quad it.
The 2nd mother board is fine. I doubt you'll need 3 video cards. The Striker Extreme 1. Has grreat reviews.