Power Amp for Magnepan MG 20.1's

I recently purchased a used pair of Magnepan MG 20.1's and I am looking to add a power amp to drive them that will cost under $2,000 either new or used.

I use my 20.1's as part of my home theater set up which includes the Magnepan CC2 center channel speaker, Magnepan MG MC1's for the surround speakers and an active powered subwoofer. I watch Blu-Ray and DVD video discs and also listen to music SACD, DTS, DVD-Audio, Dual-Disc and CD's in both 2-channel and 5.1 channel formats.

I'm looking for a power amp that will allow me to bi-amp the 20.1's in addition to powering the center channel as well as the left and right surround channels so I will need an 7-channel power amp.

I am using an Oppo BDP-93 Blu-ray player which plays all of the disc formats that I named above including the 5.1 material so I need to integrate a 7-channel power amp with my current A/V receiver so that the receiver can continue to decode the high-definition audio being received via the HDMI output from the Oppo BDP-93 player such as Dolby True HD and DTS-HD Master Audio.

Can anyone recommend a high quality 7-channel power amp that will fit my needs that will allow me to continue to play all of the audio and video formats I mentioned and bi-amp the 20.1s all for under $2,000?