Guy, you're drowning in choice so you'll need to be much more specific about your theme ideas for the shoot and the car spec' and look that you're after, as there are enough Supras on here to satisfy any and all tastes that you can think of - and quite a few that you probably couldn't imagine without taking LSD!
Since you will be writing the feature, what would you like to write about? Presumably something different that Joe Public hasn't seen before?
Stage 1 or 2 are vague terms which could mean different things to different people and give the impression that you're only looking for a relatively stock car. Some of them are, afterall, way off the scale!
I just think it would save everyone the time to submit proposals if you are definitely not looking for certain styles and spec's, that's all.
For example, if you want a dramatic engine bay shot with a pfaffing great polished turbo sticking out, you need to say so.
Presumably it's a given that the car in question must satisfy certain criteria, such as immaculate presentation, i.e. no paint defects or scuffed rims. That narrows it down considerably already. I know it rules mine out anyway!