If your looking for a good sound system then scrap the Monsoon all together... replace the front doors with components, center speaker, and the two rear 6x9's( you could do 6x9 components too if you are feeling optimistic), then get a 4 or 5 channel amp to run the speakers and then either 1 or 2 subs with a mono amp... it will be 10x better then the stock system believe me.
Polk, MB Quart, Infinity, Rockford are all good and decently priced... people will go back and forth for ever on which brands are best.. it is all up to you and what you think sounds better imo... i have heard some good and bad systems with all the top brands..
