when you're talking about a budget anywhere up to $1000, you've got a pretty broad range. my advice is to first, determine to type of music you listen to and what kind of subs you'd need for it. ex: rock, 10's are best, rap, 12's are better. it all depends on what kind of set-up you'd like. if you're going with one sub, a mono-block amp would be best, meaning one channel. always try to get the right amp for the right sub. ohm output, channel, etc. i have two JL-W3v2 10" subs with a monoblock amp and it slams plenty good enough for me, although i may not be getting the maximum performance out of them, it's still good enough for me. it all depends on what you're looking for, whether it be hair-standing bass, or a hidden enclosure that just gives a little extra sound. i'm sure the technitions at custom sounds, crutchfield, or any serious audio place would be glad to point you in the right direction. always make sure that you have the right gauge wiring to accomodate your speakers and amplifier.