The white and red Z's are okay. I think that the front end and the side cues make it seem too busy. It looks like it's trying too hard, but I still like the direction it going in.
The orange Z is good, but I hate louvers on the hatch, and the rear needs to be retooled to be more 'Z-like' (taillights, bumper). Front end.... well, it's really good. I'd rather see a cleaner look. The headlights, grill, thin bumper and turnsignals should make it instantly scream 'z'. I'd drop money on it if it looked a bit closer to the 240z.
Entry level Z. I wish.
IMO, the perfect starting point would be a smaller version of the FM chassis ( I think the Foria concept went that way). 4 cylinder motors aren't my cup of tea, but If I had to go 4 cyl, I'd rather have something like a SR20VE, with a livelier tune. 5-speed manual, 2-seater, strip out things like cruise control, video screens, etc. Z should be as minimal as possible, light as possible, but as safe as possible. The whole point of the Z is to be a focused sportscar...that's driven everyday.
Sorry about rambling, just my opinion....
--R