If you want to try an inexpensive solution (or cheap backup), a vintage Luxman R117 (160 watts/ch 8ohm) receiver ($250-325) would do nicely and if you don't play loud orchestral music but listen mostly to jazz and vocals you might get away with a luxman R115 (75 watts/channel)receiver ($125-200). I've used the big receiver with my 1.6's and it was surprisingly good. Had to spend 15X as much to get better sound (lector zoe preamp and threshold or innersound esl amp).
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Thank you everyone for your answers. It does not look like there is a consensus on which amp would work the best with the Magnepans. I have hear I should get a tube amp with some power because a solid state amp that is too "bright" could cause the Maggies to sound harsh. But I have also hear that not to use a tube amp with the Maggies. (Mixn4him suggested not to get tubes because they don't control the LF and the Maggies need an amp with good dampening.) Forgive me but I don't know what dampening in terms of amp audio is- would someone be so kind as to give me more info? Thanks!
Recommend you take a look at the Planar Speaker forum over on Audio Asylum, here ; the server is down today (Monday 1/4) but hopefully will be back soon. The vast consensus in that forum is for a solid state amp which can deliver high current (typically one that doubles power from 8 ohms to 4 ohms, possibly to 2 ohms). Some (including me) pair the SS amp with a tube pre-amp. Maggie typically demos their speakers with Bryston amps at audio shows, in line with Jallen's post. Others recommend various Class D amps (I use an Audio Research 150.2) but Class D also has a lot of detractors, so that's one that requires a personal listen. But if you look at the Forum you will see quite a few questions regarding recommended amps and the related responses, many more than in a more general forum such as this one.
One amp for sure is the Modified Moscode 300 or 600. MOdified is more refined than stock units. But with a few upgrades a stock unit especially the 600 will surprise you. The Odyssey Stratos is another high current amp that should also do a great job on the Maggies. I would prefer to have a tube preamp in the front end with those amps. The amps you mentioned above will work well with the maggies too. If you are a rocker and want to play very loud by all means go for the power. But if you are on a budget the Moscode 600 will make them sing. If you can find one. The newer Moscode amps will do a truly wonderful job too.
If you want the best of both worlds, you can use a solid state amp and a tube pre-amp. That is the more expensive solution that I use with my 1.6's. However, I think that you would be shocked at how good the vintage luxmans sound with the maggies. The R117 is rated down to 2 ohms and will handle the 12's and the 1.6's with ease. Save yourself a couple of thousand dollars and for the price of some good interconnects try a really fine vintage high current R117 receiver (if you can find one in VG condition as the volume pots can go bad)). You can always add a tubed CD player or tube buffer but I don't feel it is necessary as the amp section isn't bright or harsh. If you want to spend a lot more, try a lector zoe preamp and an innersound esl 300 mark 2 amp.
I can tell you not trying a Emotiva XPA-5, and a mills resistor is a mistake. More money doesnt mean better. As far as resistors, spend $10 at parts express, grab every size 10w .39 cent each resistor pair from 0.22 to 3.0 ohm. When you find the right resistor your looking for, pick up a mills 12 watt in that size from parts connexxion in Canda for $14 shipped to you. The mills DESTROY the cheap resistors.