Subs for Martin Loagn CLSIIs

Can anyone suggest any good low priced subs that blend nicely with my CLSIIs. I want to run dual subs (one for each speaker). I need something that works well with HT as well as music. About 3/4 of their use is for 2-channel music. Nothing harsh like rap or hard-rock. I wouuld love to get a pair of Kinergetics towers but they are out of my budget. Not to mention that people that have them don't want to get rid of them. Preowned subs are not a problem with me as long as they are in good working order. Right now I am using a Paradigm sub, but only for HT. It can be pretty unbearable when it comes to music. I need something with some more clarity and less boomy.
My room measures 12x18 with the system on the short wall. I use a Chiro reciever, Luxman CD player, and an Empire turntable for my music.