B&K 7250 200watt x 5 is a good amplifier - you can get for slightly above $1000 used.
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Audio Refinement Multi 5 (or multi 2 + Multi 3)is good.
Parasound has two in the Halo line that may be of interest.
These amps will work fine but you may get more improvement with a good pre-pro in addition to a modest amplifier. For the money the Audio Refinement Pre2 DSP is wonderful. It has no bells or whistles but does 5ch surround beautifully. This in conjunction with most any high-current amplifier should do the job.