what to do, what to do. need help please

hello all. i have a '91 crx and i have put countless amounts of money and time into the exterior. things include closed in rear side and rear windshields, "scissor" door modification, custom body kit, kameleon paint, etc. as you can tell, i'm serious about the car's appearance. now that the outside is done, i want to get into the powerplant. this is an area where i have some, but little knowledge. i'm lookin' for as much power as i can get. also, if you have any advice on a nice system setup, that would be great. i have an old kenwood system (not too bad, 750watt), but it's time to put out with the old and in with the new. something that pleases the eye, but something that can beat the pants off the other guy. any advice will be greatly appreciated. thanks.