The X-CS is the sealed version of the X-MTM towers.
They use the exact same drivers and crossover parts.
The X-MTM are designed to be used in both 2channel and home theater applications.
They will easily hit into the low 30s in most rooms, while the X-CS only play down to about 65-70Hz.
Otherwise, they share the same sound signature.
And considering your taste in music, I think you would have no issue getting lots of enjoyment out of them.

The X-SLS would be a good option, as well as the upcoming replacement for the AV-3 towers which will be a smaller transmission-line version of the X-MTM using our smaller M-130 woofers.