I am using Ohm Acoustics Model I speakers, purchased new in 1980 and recently upgraded with new drivers. (www.ohmspeakers.com) They are 4 way bi-wireable speakers capable of handling alot of power.
I was using the Parasound 2200II amplifiers, set up in mono, one amp for each channel, two sets of speaker cables from each amp into each speaker (vertically bi-amped and bi-wired)), and a PLD-2000 preamp. I tried the Adcom GFP-750, but prefered the sound of the PLD-2000.
I have no complaints about the Parasound system. It was inexpensive (about $2000 total) and sounded very nice. It worked just great. I got the upgrade bug and bought the Odyssey Audio Extreme Mono Blocks and a Tempest preamp (new), based on glowing reviews about the Odyssey products. I like this system's sound better than the Parasound, more detailed and transparent, but it cost about twice as much as the Parasound system. I'm currently in the process of breaking the Odyssey system in. I still have my Parasound system, just in case. I'm not ready to let go of it just yet.
Have Fun!
Rick