The Palit 2GB GTX 460 has gotten some bad reviews and isn't quite worth the money. What is a good option is the EVGA External Exhaust GTX 460s with the Lifetime Warranty. In SLI, they'll best a GTX 480, and are easily overclockable.
Plus, they are eligible for EVGA's stepup program, so you can upgrade to 470s or 480s via EVGA within 90 days of buying your 460s and only pay the difference between the price of the new card and what you paid to get yours.
I have a pair of those cards and they are great. I may upgrade to the 470s for a future Tri-SLI, since it'll only cost me $77 per card to upgrade.
If you pursue a Tri-SLI build, you'll want an 850. With 2 460s, you'll only need a 750W; I'm running my i7-930, 460s, tons of fans and such from a 650W continuous PSU, which is effectively a 750W.
Get the OCZ Vertex SSDs or the Corsair C300. Hands down, they are the fastest SSDs. I would only put the OS and some major programs on there (Office, and maybe a game or two), and add a 500GB+ HDD for all of your games, programs, and applications.
If you live near a Microcenter, you can get the i7-930 for $200+tax, as opposed to 280 online. If you can only get it online, just chip in the extra couple bucks for the 950.