goBoating: looks like you did some research. You're correct that the vue redline has ground effects as well as nicer rims, but features the same 255 hp honda engine from the accord mated to an AWD tranny. Nice lookin cars.
The sky redline features a turbocharged 4 banger putting out 265 hp, the non redline is just a solstice.
For the ion, instead of braces to reduce wheel hop I used hp tuners to cut boost in first gear, and as the rpms rise the car bypasses less and less to that by redline I'm putting down about 80% of the stock boost, shift into second and its 100% boost. This pretty much eliminated the wheelhop and instead of turning hop into smoking tires has made my first gear quite usable, so I'm gonna have to run the rex from a dig now just to see how it fares.
You're also correct about the dyno sheets. 06 and above redlines have been dynoing 225whp pretty consistently, so yes they are very much so underrated and stock for stock from a roll would be a bit of trouble for a WRX.
My redline doesn't have the huge park bench so I enjoy it very much.
Also, anyone can fit in the sky, it's a convertible man!
You've certainly done your research.