Off of that amp you will be just fine for now. To compensate for lack of power it is good to put the subwoofer into an oversized box as larger enclosures are more "efficient." In 1.7ft^3 it should sound great! A Hell of a lot better than in some pre-fab. lol
I have had a few amplifiers in the area that you are probably looking for but they all sold. Though my current amplifier is for sale.
Probably a little bit out of your range though. lol
Crescendo 3kwp:
4 ohm power @ 13.8V @ .3% THD 855wrms
2 ohm power @ 13.8V @ .3% THD 1650wrms
1 ohm power @ 13.8V @ .3% THD 3,370wrms
.5 ohm power @ 13.8V @ .5% THD 4,030wrms