There's really no reason to quadfire 4 last generation cards. The scaling isn't worth it. You would be better off spending a little more to get 2x 5850 or 5870.
If you're spending that much, the memory is a little underwhelming. For $98 (or $78 if you make the MIR work), you could get this 1600 MHz CL7 Mushkin kit, or $105 for this G.Skill ECO series kit. Just for gaming, you don't really need 8 GB. If you plan on doing editing tasks or running some VMs, 8 GB might come in handy. For a little more, you could get CL6 memory if you wanted.
I would suggest googling SLI 460 benchmarks. You would probably get better value, but (and I could be wrong) I don't think that you would get better performance than with 2 5870s, but it may depend on the specific games you are looking at. You might get similar performance to 2 5850s. Again, check out the benchmarks.
And yeah, that's a good deal on the RAM, but since your budget appears to be near $2000, I don't see any reason why you wouldn't spend a few dollars more for slightly tighter timings. If you were on a more limited budget, then they look like they would be a solid choice.