Does your classical music listening have a lot of pipe organ? Neither of the subs you mentioned in your OP will give you true 20hz and below output. Each will roll-off much earlier and will be helped by any room gain.
If you really want low distortion, high output pipe organ you will have to spend a bit more money especially if you have a large room to fill.
Another sub to consider, depending on the size of your room, is
Rythmik Audio's F12. According to Rythmik's specifications, it's 3 db down at 14 Hz. Also, the internet says, it's supposed to be excellent for music.
