Get a Soundtream Reference1000 if you can find it.
Should run about $400-$500.
1000Wx1 at 2 Ohms in "High Current" mode.
Pure and clean power.
It's a bit older, but late 90's Soundstream equipment is still some of the best stuff out there.

1997 GL Sport MTX,
Soon to be the fastest proven Zetec around.