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Two subs that handle 200w rms each is not going to cut it. If you really want to piss people off, you need to spend the time and money and ideally, it would probably cost about a grand (which includes, sub, box, amp). Probably a tad less if you score a nice deal, but my definition of loud is much different than yours. I piss people off with no subs, just a stock frontstage, all I gotta do is just crank the volume.
To answer your question about turning the gain up past halfway to full, well that COULD BE fine, but the majority of the time it isn't, and always is never a good idea if you don't know what you're doing. IMO, you need to upgrade your equipment. I say in the mean time, do some research, find out whats good (SEARCH THE THREADS), save some money, and when you have narrowed down your decision maybe make a post and ask what would be recommended. It's pretty much the road we all take. Start off with a system we think is the ****, then find out it really is ****, then upgrade to mainstream, and then find out theres better products at much more reasonable prices. From then on, you switch setups like your underwear (provided you have good hygene), and you go through several setups till you finally find what you really like, but really you havent, and then you finally do.