Well the subs trash but it will work for a while anyways. by the way it could only take 800 watts for a milisecond then it would EXPLODE. the wires on that box look like 16 guage which means more then 100 watts rms is too much.
But you have it so too late, lets move one. Cheap amps can be found but it depends on you definition of cheap. basicly under $150 isn't an amp at all its just a noise generator. The least expensive thing I would ever reccommend is the Kenwood KAC-529S, and I am compromising my morals a little here for your budgets sake. the 629S would be better. My Uncompromised recomendation would be the alpine M200 mono amp. Jenson, Us acoustic, profile, aiwa, and sony RE NOT BARGINS. There power ratings are done at max to make you think they are more powerfull then they are. An alpine amp that puts out 250 watts rms is the same price as a Sony that puts out 250 watts rms and is the same for every manufacturer. unless you get into the high line stuff but I don't think thats an issue for you just yet.
If you have to chince out and by garbage stick to profile its pretty much the most reliable garbage.