Be honest with yourself and your budget.. is the best advice I could offer.
Since you didnt mention what gen lude you have. i will assume 5th gen. If so... I would swap out the front speakers.. and see if that helps what you are aiming for. Then change out the headunit.. and the rear speakers.... then maybe add some more bass in the trunk.
get ready for the sound in your car to totally be changed from the stock system... hope you like it.
Headunit makes all the difference in the world. Also, proper installation makes a huge difference, too. The best thing you can do is listen to different types of headunits and speaker. I am personally partial to Alpine headunits, Eclipse components, and JL amps and subs.
The cost depends on what you want. Take a look at www.crutchfield.com. They sell all of Alpine's head units, with plenty of pictures and detailed descriptions of the features. Their prices are high, but they come with a full manufacturer's warranty. If you're willing to lose the warranty, you can save at least $100 on just about any head unit.
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