Definitely get a couple high-end monitors. I prefer CRT over LCD for games, and higher resolution... but that's preference. Seriously, if you are getting a fast card like the 9x00, dual monitors are great. Not terribly useful for games, but I'll never go back to a single monitor setup again.
I agree with the specs posted before, my preference leaning towards the Barton setup. Grab a fast Plextor/Lite-On burner while your at it, and Audigy II card for the games, and a DVD burner if you're into that. The new Logitech MX500 mice are great, the MX700 if you want cordless. Klipsch Promedia 5.1.... Anything I've missed?