McIntosh 501 or 602 for Magnepan 20.1

Has anyone tried any of the big Mac amps with Magnepan 20.1? I'm in the search for an amp. I'm considering:

Krell 400/450
McIntosh 501/602
Rowland 302
H2O Signature Mono

I'm running an Audio Aero CD player so no preamp is involved. I have heard to bypass the H20 and Rowland since I don't have a preamp but I haven't had a chance to try it in my setup.

Thanks...