amp upgrade


Hello all. This is my first post! My system is as follows (mixed Home Theater and Two in Channel in one):

Arcam BDP 100 (cd analog out to preamp)
Rogue 99 Magnum with custom HT Bypass
Rotel 1056 Home Theater Receiver
Rotel 1070 amp
B&W CM4s
MIT AVT3 speaker cables
all kimber timbre interconnects

*I listen to mostly Jazz, some folk

My question is i am looking to upgrade my amp...I am only willing to buy used (cost). I am strongly considering McIntosh (e.g. MC 2105) and Bryston (e.g. 3b). My question is also will both of these examples (which are both 25 years old) be noticably better than my rotel which is probably about 8 years old. Then what other amps should I be considering? Thanks so much for your insight!
scifidelity
I used to have a 1070. The Bryston would be a step up, but that doesn't sound like where you want to go. Since you've already got the Rogue 99 preamp, have you considered looking at the Rogue amps? They seem to offer good power/price performance and are well regarded. You'd get synergy between those two components and any number of their amps would easily drive your speakers. 90db @ 8ohms is a pretty easy load. 50 Watts of good tube power would probably do the trick.
I would look into a Rogue 90 Stereo amp. You can also tube roll to tailor the sound to your needs as you can with the 99 Magnum. If you like a warm sound I would not go with an older Bryston. The Rogue's are neutral in my opinion for a tube amp but rolling tubes you can warm it up or make it cooler.
I would even look at the Atlas. It's even cheaper than the 90, and the Magnum upgrade gets you 90 watts per channel. It doesn't list it on Rogues website, but I believe it can be factory fitted with the new KT120 tubes, which are supposed to be excellent. It would be hard to go wrong with that for your first foray into a tube amp.