Definitely opt for the premium.
For me it wasn't even a choice. My '06 was premium model and I couldn't see myself doing a base model Mustang in either powerplant. If I could see myself in a base model Mustang, then there would have been a base 5.0 GT sitting out in my yard right now instead of a premium v6.
Go for the premium. The amenities it has over the base model are nice.
For Play: 2011 Ford Mustang v6 Premium Coupe w/Pony Package. Stock...for now.
For Work: 2011 Hyundai Sonata SE. The fun daily driver.