I have owned many Mac amps including MC2500, MC2600, MC7300, MC7270 (and more than a few Mac tube amps). I currently own Simaudio W-10's. The W-10's will give you more resolution and transparency (and bass control) without being hard than the Mac amps which will have a warmer but not as resolving sound. Check out audiophilia.com for a new review of Simaudio W-10's.
Happy listening
Happy listening