Dreamcasts are still have a big cult following - some of the games still fetch silly money. It also had the biggest cult following because of the emulators and homebrew scene programs than can be run on them as standard - they do not need modifying. ScummVM is good on the dreamcast - Plus you can pick them up at cash converters/car boots for like a tenner.
I still had one until not long ago, used to love playing MSR and Gran Turismo 2 on bleem! The graphics arent that bad either especially if you use a VGA box. Hmm... might buy another actually....
Dan