I was going to recommend an ATi amp to drive those tower's. Something alone the line of say 200 X 2 @ 8 Ohms load. Do you have the matching center channel?
They are somewhat power hungry and you do have a lot of drivers to drive. What? 6 total 7" drivers plus 4-5" 1/4 drivers total. I would say under powering more than likely took out your mid driver's.. * had the little brothers RTi- A5 loved them shouldn't have sold them off.
Beautiful speakers, those are definitely worth replacing the mid-range drivers. You would have to come out of pocket 3k+, plus, probably more to get an improvement over those. An ATi-Amp set your back about 1500-1800 bills. Just a suggestion and an opinion.
Edited: just read you could up your budget, well than an juicy ATi two channel Signature amp would fit in nicely.
You like to listen very loud huh? Reference level?