I have to do things in stages. my running Celica is my daily driver and the drift Celica is in a very early stage of development (and not running).

For now I want to install a cheaper headunit (haven't decided on one yet, accepting suggestions). Install Optima battery. Install E-ram bracket for laptop. Install 8 inch Memphis MSYNC8 components in front doors running off a 2x75 MCA150 class AB amp.

Later I will modify the rear speaker panels to be enlcosures for 8 inch MC84D subs running off a 2x150 MCA300 class AB amp. Add 2 VBF1 line drivers, a XO3 crossover, and a 1CBFMT capacitor for clarity.

To finish off the system, I will build an indash carputer. More on that later...

Overall a sound quality system. I spend 4-10 hours a day in my car driving to appointments.

Questions:
1. Should I add the capacitor, crossover, and/or 1 line driver now, or wait for subs?
2. Could 10 or 12 inch subs possibly fit in rear speaker panels? Or 2 8 inch subs in each?
3. Any suggestions for headunit? I plan to replace it within a year or so. Preferably it should have a line in, although I could us a FM transmitter hooked to the audio out of my laptop.

Lastly, this is not a request to buy, but if anyone has any extra audio equipment I would gladly take it off your hands so I don't have to spend money (or as much) right now.

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Here's my opinion:
1) Don't waste your money on a capacitor. They are just a band-aid. If your alternator can't handle the power you're drawing, then a cap just masks the problem until your alt dies. Crossover for what? The subs? Most amps will have built-in crossovers that you can adjust. I've never used a line driver so I don't know about their value.
2) 10 or 12's in the factory rear speaker location most likely wouldn't fit due to lack of depth. 1 8in could fit with some modification. Here's your biggest problem with putting subs in the factory rear location: MOST subs require an enclosure. I seriously doubt you could design an enclosure that has the proper volume for that speaker to fit in that space. You can still put a sub there but it won't sound nearly as good without an enclosure.
3) As for the head unit, I used to think the head unit didn't make much difference in sound quality, that is, until I bought my Alpine 9855. I'm not saying you have to spend $500 on a hu but don't get a low-end model either.