Being a base model owner, the first thing I upgraded was the horrible stock head unit to a Kenwood DNX 6140 Navigation Double Din unit.
In terms of performance, I would go with a Stillen Gen3 CAI. I was weary about taking the front bumper off at first, but from looking at the DIY and the testimonials, it's a no-brainer.
Stock suspension is fine but I'm used to driving more "stiffer" vehicles. So I'm planning on getting some Hotchkis sways unless another company comes out and makes adjustable front sway bars as well; I'm debating between Hotchkis and Stillen sways at the moment.
I think the first thing you should get however is tint! I still don't have tint on my baby yet because nobody around here in Georgia carries 50% tint
