I’m afraid at a $1000 budget you may be doomed to failure. Not only because of the amp, but also because you apparently also need a preamp — do not neglect the importance of the preamp. Your most cost-effective option is probably an integrated amp.
I know Maggies fairly well and I own a pair of .7s. I've used a lot of different amps on various set-ups with Maggies. The budget solution is a Musical Fidelity integrated. A M3si will work but a M5si would be better. Don't let the 85wpc of the M3 scare you away, they have good reserve power. The buy once cry once option is the M5si.