I would like to upgrade my current speakers. I currently have two Mythos STS as fronts, CS8060 HD center, and Gems as surround. I am about 50% movies 50% music. Music is very important though. Room is roughly 25 x 13. I have an Oppo 105, emotiva umc200 and emotiva xpa5. No sub.

Will Sierra Towers with Horizon center be a significant upgrade to what I have now? I would need a nice musical sub to go along with that.