yeah it really depends on the cash. But to start off, i would get a good set of componets for the front. Put those in the doors, and if you have the speakers in the dash, maybe some tweeters up there. Replace the stock radio if you have the cash, and use an amp to the componet set. This is a good place to start, and maybe add a small sub and amp to fill out the bass. You could get a 4 channel amp and use 2 for the fronts, and the other 2 channels for the sub, assuming you can bridge the 2 channels into 1, or just get a dual voice coil subwoofer. I would definately replace the stock speakers first before anything, good sound starts with good speakers...

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
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-1998 Mitsubishi Eclipse RS-T- "Toy"
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-2000 Honda CR-V(daily)