I wish I could say I've heard all of the brands I recommended, but I haven't, funds just don't allow it. I have heard Velo, Klipsch, JBL, Paradigm, and an off brand or two, for home use and I don't know how many car subs(that's where I started my audio addiction).
From a looks stand point, the wood veneers that the ID's use are second to none, there are a ton of pictures on this site just look around in the Subwoofer forum, some of them are down right gorgeous, and some are being used as end tables. You can get an 8" or 10" sub if you want but it's not going to pressurize your room like a larger sub will.
Everything that everyone says when they get one of these subs, is that they offer a much better "boom" for the buck. I can tell you I wont be getting a Klipsch sub, they don't offer enough for me, and the Velo's I like are $$$.
Search the brands I listed and see what you like. SVS has some good deals in the B-Stock section if you catch them at the right time.
T