I'm trying to stay on the budget side of things, but I know full well, you get what you pay for... The only reason I have the m75-4 picked out is that I'm amping my front two speakers and thought i could bridge the last two to the sub. Now i know that 160 watts wont really be enough to feel the bass. So as of now, im looking for two new rear deck speakers that will be able to be amped to make my system sound pretty decent. The sub can come after that. When that does happen however, do you guys have any suggestions a good, loud budget sub/amp combo?