I have a denon receiver a pair of b.a.vr950,10' sub...I would like to own me a pair of the larger magnepans in the not so distant future.But first I would like to add a power amp,use my denon for a preamp,figuerd it wake up the boston's for now,I will most likely by used,I cant afford a really good amp new...Im strictly 2 channel,but I'll go with a multi channel amp if its the right price...give me some advice on what to buy.