Hi Dustinbiz,
Cool system, I agree the ESL 2905 is one of my favorite all time speakers. I've heard them out here on the West Coast[SF Bay Area] with several tube monoblock systems. The one thing about the Quads is they are very sensitive to up stream amplification, preamps they really are pretty picky! I have nothing against Mac gear in general but I would have to say with your speakers they may be a just a bit bland, maybe bass weak. Amps I've heard them with in order of price, form silly to very affordable! Viva Linea, Viva Aurora[845 amps] ARC-110T asl AQ1006 845 DT MKII, Jolida JD3000a mono blocks I'm sure their are many others.
The ARC and Jolida's I've seen for a very good price on Audiogon. If you get a chance to listen I think you will make up your own mind. The Jolida are 200 wpc but don't sound like it, they also have a LOT of low end grunt and great mid-bass. 211/845 triod amps have a sound and control all their own.
ARC, just makes great stuff!
Something to check out if you can.
Happy listening!
Vinyl9