hmm...lead singer/bassist with psycho girlfriend - nope I won't do it; too easy!
The best you're gonna be able to do (as far as power and quality per dollar) for that amount of money is a used Galien Krueger 700RB or 800RB and a used 4x10.
>>>EDIT: Nice catch on the Carvin, NoGrave! I used to play Carvin gear myself - good value, enough power, sound is OK, rugged enough to tour. You can probably get a nice used Carvin head, a 2x10 AND a 1x15 for $700.
Of course you never know what kind of sweethear deal you MIGHT stumble into, so by all means keep your eyes open, search the Bay, Craigslist and everywhere else you can think of. You're gonna want at least 300 watts at 4 ohms (more is better) and a multi-driver (4x10, 2x12) cabinet that can handle what your head puts out.
I recommend staying away from the GK Backline series, and do NOT be seduced by the apparent value of Behringer equipment. Just my opinion, of course.