Define small, tight, musical. Small is kinda easy, but measurements help. Tight is a strange word as is musical as they're completely subjective and vaguely defined. How does a sub match a Kef brand speaker? Personally I'd say keep the Dayton and save some money for a better sub, i.e. one capable of significant output (so you have sufficient headroom for now and the future) and/or extension (i.e. how low a frequency it can capably reproduce within a small range of the rest of the frequencies it can reproduce). But that's just me.
"I realize that somebody playing free music isn't as commercial as a hamburger stand. But is it because you can eat a hamburger and hold it in your hand and you can't do that with music? Is it too free to control?" - Don Van Vliet (aka Captain Beefheart) discussing commercial success in the music biz