GMC56,
For under $1000, my favorite amps for use with Magnepan speakers would be the McCormacks. In that price range, you should be able to pick up a used DNA-125, a DNA 0.5 deluxe, or perhaps a DNA rev B or C. All of those amps would also work fairly well if you went up to 1.6QRs or 1.7QR's in the future. I used a DNA 0.5 deluxe and DNA 1 deluxe amps for years with my 1.6QR's.