He doesn't have to spend that much on a processor. Minidsp is cheap and it works. I dont use one but a lot of people do, and like it.
For the farelane, I would go with what jeff suggested. clarion cz702, silver flutes and vifa tweets. Boom, $220 otd for that setup.
The supra, now thats a little tricky. Your gonna need to find a capable 3.5 - 4" midbass and use the vifa tweet again, clarion cz HU for it too.
supra is pretty much set for amps. That black ice should be able to handle all speakers and sub work.
Grab a ppi phantom 900/4 for the farelane.
Suprised nobody mention this, since you have 2 old cars that are probably rattle traps and loud. use the rest of the money you saved for deadening and sound proofing your cars.
Btw, love those old school Supra/Celicas. When we where learning how to drift, I had a celica that my uncle gave me. we beat the **** out of that car, but it kept on going. Those 22r motors are bulletproof. Literally... check the episode of Top Gear, where they put an old toyota helix, that has that motor, through a vigorous torture test. Needless to say, the truck kept on starting and going to the next challenge.