Here's a few add-ons that I've done since installing the spoiler w/rear-view camera. Eleanor grill, rear splash guards, 5" antenna, padded console cover (a real relief for elbows), cheapo mustang puddle lights (removed the passenger side one due to bad rattling while playing radio) and strut tower caps.
2012 GT Premium w/Nav bought from Carmax this spring. Am hoping to add a few goodies such as a backup camera, etc. Not sure if that will void the extended warranty. Maybe I'll just get some neck grease instead .. ha !