Yeah, take a look at precision power, phoenix gold, or mtx. For a little less costy amps (but still usable on those 2 10"s), check out pioneer, jensen, sony, kenwood.
A good 400W amp will cost you around $150-$250 depending on which brand you buy and how much discount you get. Just remember, in the world of car audio, expect to pay about a buck a watt!