I have the Dell Latitude D600 that I do most of my work on:
But I've also got a Dell Optiplex GX240 that I use to keep open running programs, test environments, shared drives & folders, etc.
At home I just use my D600 but I have a desktop there as well. Its a hand-me-down from a friend & I hardly ever use it. All I remember about it is that its a Hewlett Packard.