Subwoofer for Magnepan 1.6's


I have a pair of Magnepan 1.6's, connected to a McCormack DNA 1 amp and tlc1 preamp. Eventually I will be incorporating them into a surround system, using the Arcam AVR 300. I am looking for a good subwoofer to go with the Maggies. I have a small listening room 11 x 14 and don't like boomy bass. I have heard good things about the Rel 3 and Vandersteen subs.
dgplo
Martin Logans also mate well with planars. Their subwoofers are also compact in size and can produce tight bass.
Thanks for all the good suggestions, should make looking for a sub a fun process...
Dgplo - Awesome, good choice. Were you able to integrate it pretty seamlessly with your maggies??