If I had to recommend one console to have out of every one iv ever owned and believe me thats just about everyone released. I would have to say that the SEGA Dreamcast would be the finest console iv ever had the pleasure of owning. Although not the sucess SEGA had wished for mainly due to stiff competition from Sony.
The Dreamcast had some of the most amazing titles around and even now they dont look dated at all. Games like Shenmue, Virtua Tennis, Sonic Adventure, Resident Evil Code Veronika, Power Stone, Virtua striker, House of the dead 2 and just about every other major SEGA arcade release made an appearance on the Dreamcast.
Every Genre was covered and with games costing but a few pounds these days you would be crazy not to tap into the wonderful world of the Dreamcast. I have a universal Dreamcast and have found games that never even made it here to the UK thanks to an on-line auction site :)