My HT in medium size room is based on M22V4s on stands coupled with a pair of EP800V3s & QS8 V4s that produce a great HT experience - way more power & capability than I can use.

One of the best upgrades that you can make is a VP 160 or 180. I have the 160 that is a powerful & outstanding performer with a more 'conventional' driver layout for a horizontal speaker than the 180. Furthermore, it is somewhat smaller than the 180 so that might fit your space better as well...

TAM