I own a 2007 ZX3 with the full Roush kit. From what I've been able to find on the web is this: the authentic pre-2005 ones were 2.3L's, and had springs/shocks, and rims. However, depending on the stage, some things were optional. For example: A Stage 1 only came with the front facia, hood scoop, rear wing, gauge cluster, and exhaust. Everything else fell under a Stage 2, which had: front facia, hood scoop, side skirts, rear bumper, rear wing, exhaust, gauge cluster, and STS.
Again, this all could be wrong, but after trying to find out more about them, this is what I was able to piece together. As far as price goes, I paid $9K for mine with 36K on it last year, and mine has the front facia, hood scoop, side skirts, rear bumper, rear wing, and exhaust. So I'd say that price is pretty steep. And my friend bought his SVTF for $6500 with 92K on it, and that was even a little steep.