I would get the Gt500 without even thinking about it.
I like the way the new S550s look and I am sure they will be great cars but the 13/14 GT500s just look amazing. Throw in the power factor and limited edition aspect and I am sold.
Having the newest mustang would be cool but it would wear off. I would still rather have an 07 GT500 than a 11/12 mustang GT but thats me
Current 2012 Lexus RX350 & 2011 Ford Escape XLT
2012 Grabber Blue, GT Prem, Sold 8/20/2012
2014 Ingot Silver Focus ST ST2 W/ Moonroof and Blue Recaro Inserts: Ordered 05/22/2014