which one did you go for in the end?
I have just fitted (just because I could before any one gets on their high horse saying whats the piont!) An Alpine 6.5 double din screen and dvd player, attached to which is a PS2 in the glove box with the controler sockes in the arm rest, rear reversing camera (tinted windows from previous owner made it hard to see when reversing) phone kit through the stereo, 4ch and mono block running all speakers rather than the built in amp and a 12" alpine type R sub.
Would be interested to see you instal when complete, its awsome having a screen in the car! only thing missing is the sat nav! but now im flat broke! lol
If you need any help fitiing anything give me a shout, as ive done everything my self.
Oh and touch screen rocks, the angle of the screen in the dash doesnt seem to show the finger marks... which are easily wiped clean.
double dins in the celica can be bolted in... this makes them a no go for smash and grab theives who would need to sit there and know how to dismantle the relevant bits of dash to get at the bolts.

of course there probably always one little g*t that will do it but then that one will breaking no matter what.