Best Cheap Amps for Magneplanar Speakers

@russbutton mentioned Hafler as a cheap amp option. I used a Hafler DH220 with Maggie 1.6s in a small room and loved the sound. These are MOSFET amps and do have that smooth sound MOSFET's are known for. I recapped the amp as the original caps were past their prime.

You could purchase two DH500s, recap them and have a wonderful sounding pair of amps. And the good thing about these amps is, if they don't tickle your ear, you can resell them.

Maggies are too good for a cheap amp

Currently using Nord One UP Hypex NCore NC500 with 3.7i. with Sparko op amp option.  Plenty of power, room size 24x14 x10

I am currently using a full set of Audio Alchemy including their mono blocks driving my Mag 1.7s. I switched to this setup after one of my Audio Research Classic 120s sparked out. I'm very happy with the resulting improved sound stage, clarity, etc. In full disclosure I am also using a REL sub and Audio Quest cabling as well as a Silver Circle A/C filter.
Check the Absolute Sound/Robert Harley article.
http://www.theabsolutesound.com/articles/audio-alchemy-ddp-1-preamplifierdacheadphone-amplifier-dpa-...

I biamp mine Maggies with Bryston 3Bs ...I bought them used and they were not particularly expensive.