cheers for the input so far guys.
the power delivery isn't the issue - i have that planned out, i hope, and its molded around the fact that i keep the existing engine as don't want the troubles of engine swaps etc.
@aido, yea i know what u mean about the supra TT mate, i do love em, but the only thing putting me off is the relative age of the cars and their inherent nature for being tinkered with (not that it makes them a knacker or anything like that, but maybe not knowing what ur getting kinda thing).
i've spoke with a few people on here and off, and i'm torn at the minute between getting rid of the IS and getting something with more power as stock, or going the whole hog on the IS. Thing is, i love the IS's character, comfort, etc etc and its probably gonna be hard for me to let go of it. It looks wicked in white, its not very common, and certainly is something that i wanna savour for a little longer i think. It still puyts a big smile on my face when i boot it!lol!!
so any more thought on what other upgrades would be a must. so far its looking like rods, pistons, injectors, ECU and clutch. The standard IS diff, transmission and gearbox should hopefully be up to the task though?