Driving 86 db speakers properly isn't an easy task ,without knowing your budget I've gotta agree with the McIntosh 4100 & I'll give my reasons ,if you need to upgrade and use an external amp the Mcintosh preamp section will far exceed the performance of the usual recommendations of the insanely priced Pioneer SX-1980 ,another favorite of my receiver days is the much overlooked and reasonably priced MCS-3125 ,it's got a beefy 200wpc amp section and a preamp section that I found to far out performs the pioneer spec series separates I had ,the MCS was made for JC Penney by NEC and it was made with upgrading to separates in mind ,you can use the onboard 200 watt amp ,or use an external amp to drive your woofers and use the onboard amp to biamp with the MCS amp section on top,I did it with Teledyne AR-9s with outstanding success ,the MCS will be reasonably priced like the McIntosh 4100 ,I'd stay away from the usual suspects simply because they now cost more than a pair of top of the line 600 watt Emotiva monoblocks along with a fantastic preamp .