Thanks for the reply.
Yes I've did a bit of A-B testing and the Monitor 40's are definitely brighter than the Jamo's (can be a bit harsh on the ears at times). The RTi's don't sound too great (really thin), not sure if they're damaged or if its an equalization thing, the Monitors are definitely fuller sounding.
What I might do, is keep my Jamo surrounds, and use the Monitor 40's as mains. I would then like to replace the center channel with another Polk to keep the timbre the same.
Any recommendations on a Polk center? Used is OK with me, but I would like to spend under $100 (preferably $50 - $75 used).
I'll then use the RTi's in my office as my main speakers (2 channel setup). These will be hooked up to my computer, any recommendations on a small 2 channel amp to drive them?