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[touringcamry]

How much are you looking to spend and are you considering a subwoofer? What does moderately priced mean to you for a head unit.

If you want a sub, you might consider leaving out the rear speakers completely because it's better for imaging.

If you replace the front door component speakers with another set of components, then you can put the replacement tweeter in the door where it is right now. If you get coaxials, then no, you cannot put a tweeter where it currently sits because the tweeter is built into the speaker.

I am running Arc Audio 6000 components and it is an excellent set of components and they ran about $300 for the set. Focal K2 components are really good too, but I think they cost a bit more than my Arc 6000. Before you go and buy a set of components online, you should really consider auditioning them because they don't all sound the same. I remember listening to Infinity and MB Quartz component set and they were really harsh to me but some people like the way they sound - it's personal preference.

For amps, something like an Arc Audio KS 300.4 runs maybe $300 or so and will power your front and rear speaker or front speakers and a sub.

For amp kits, look at those from KnuKonceptz.com . Their amp kits are very competitively priced compared to what you might find in stores and more heavily marketed brands. From experience, though, if you mount the amp in the trunk, you'll need more than the 20 ft of speaker wire provided with their kits. The 12 gauge wire they provide is a bit overkill for most installation though.

Try to find a good car stereo place near you. Places like Circuit City and Best Buy often don't have as much selection. I went to Circuit City for something recently and I had to pass through the car audio section; from what I saw, they only had two component speaker sets that you could get in store - not good!.