Definately the Xerox DC12. I just set up one of these at my work a couple weeks ago and the printouts look incredible. Of course I'm talking about a $200,000 laser color copier/scanner/printer, but man....such quality! 🙂
Otherwise I'd definately vote for HP. My 2000c has always worked beautifully, and I've printed out well over 6,000 pages on it. If I was buying a new printer for a home user, I'd probably go with either the HP 970Cse (automatic 2-sided printing, 2400 x 1200 dpi, $399) or the HP 1220Cse (13" x 19" paper handling, 2400 x 1200 dpi, $499). Can't go wrong with HP.