What amp do I need to power my Acoustat 1100

I agree on all points. It seemed the OP was leaning more toward SS, and thus my first response(regarding MOSFETs, high output, no thermal runaway). Knife fight? Bring an M-16(why waltz when you can rock 'n roll)! The AVA amps I suggested would still give him the ability to tweak their presentation, via their driver tubes(and perfectly fit his price range). Personally, I left tube pres behind years ago, first for a Placette Passive, then my TacT RCS 2.2X(a radical departure from my minimum-signal-manipulation/eschew-anything-digital days). I plan to keep running my modded Cary SLM-100 monoblocks 'til the wheels fall off(ya gotta love those TungSol CTL roundplates and Sylvania 6SN7Ws). Plenty of power, bi-amping Maggies with a SS/transmission line bottom.

Another best-of-both-worlds hybrid amplifier, which gregadd is planning for his new MartinLogan CLX's, is the latest Moscode hybrid from George Kaye http://www.moscode.com/

And while I feel this is a great way to bring some tube signal preservation to voltage hungry speakers like Maggies, I'm still not sure I'd want a ss output device driving stats, despite the ability to tailor the sound with the driver tubes.

Simple: PS Audio HCA-2. On my 2+2's I've tried McIntosh, TNT-200, and Hafler 9500 but none came close to the new technology in the HCA-2. No noise, no hum, no heat, no strain. Stereophile "A rated" for a reason.