There are actually quite a few people who used their DIY sub into an end table... and it's really more a question of aesthetics.
You should first choose a driver, enclosure volume, and matching amp. What is your budget for this sub? If you want to go with a 12" vented enclosure, the Shiva is a good driver especially for the price but there are other popular choices for more money.
Some examples of subs can be found here:
http://www.acoustic-visions.com/~aco...omer_showcase/ and check out Darren Thomas nice looking sub.
Later...
Rob