I've got several Macs and have had several more, but my favorite all time computer is my iMac 400.
It's not as powerful as the DPs, but it always did everything I asked of it. It is quiet, small and friendly. The slot-loading CD is great, the speakers sound decent and the screen looks good. The iMac was a winner.
I've got mine working as a file server in OS X and it really delivers. I get slightly better performance from it than from our dedicated Win2K true server running similar PC hardware (which I dumped for a variety of reasons).