Tube integrated suggestions?

I am curious if some of your are using something other than an sim integrated with sim cd player>I am using 5.3 player with simple i3 right now eventually will upgrade amp.I am for the most part happy with the synergy of the two but would like to know if any body had sim amp and took the leap?thanks.Cd player and the rest of system stays so just people with the 5.3 and related product experience (adagios,az cabling as well).thanks
Cary SLI80, Manley Stingray.
Thankyou rbeich,ill look into theses two units.Both are well noted.I think about 2500.00 used would be my limit.I would love to think a amp with self bias could be available at that price.