a Dell Dimension E520! This replaces the old and sad Dell Dimension 4500 that's about to be shot in the head.
Anyway, your Pun Salad experience in the next few days may be either (a) faster and smoother; (b) not work at all; or (c) something in between.
By the way (geek talk follow), I don't recommend getting an ATI graphics card-equipped machine if you'd like to install Linux on it, especially if you prefer the latest and greatest Fedora release. This recent Slashdot article explains why.
In related news, it's Sysadmin Day! Do something nice for yours.