Dreamcast was the best system ever. Seriously how many things at the time could give a twelve year old the gift of Sonic and masturbation, not at the same time of course.
Just kidding I had a PC for that

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On a more serious note, DC's library contains some of the most awesome, innovative games ever and the hardware itself was revolutionary. The controller is STILL my favorite analog pad, it's ergonomic perfection, too bad the D-Pad sucks though.
And everyone knows when you are playing Dreamcast because it's shrieky servo motor for it's disc drive can be heard from a mile away.
If you don't have one, buy one, a 100-pack of CD-R's, and $5 to access SegaHub and just start burning games to your hearts desire.
Sure,.. you can buy a used DC or PS1 for about $15,.. but I've learned that everything has a limited life of use. Plus no telling what has happened to the used consoles. I prefer a brand-new in the box version. PLus I think it's kinda cool to buy a 90's console that's still sealed and unused. It's like you're opening a time capsule. (if you can't tell,.. I'm a really nostalgic person.)
Look in to buying mint condition used, it's far cheaper if you can locate it. Got a Saturn a few years ago for $80 with everything, including warranty cards, literally looked brand new. The controller had a tiny scratch, that's it.