Congrats on the new car! I bought all my stuff from Sonic Electronix. Each item i listed above has a link to that particular item on SE. They're a great company and cheapest around from what i've seen.
I like sonic, a good trick with sonic use there offer button (only offered on some products) next to buy button and to figure out what there lowest prices. Image Dynamics CXS64 v.2 6-1/2" Chameleon Component Speakers System
These can be had for $209 which is a steal for these comps..
2011 GT Coupe Premium | MT6 | 3.73's | Security Pkg | BREMBO | Comfort
Installed JLT oil catch can, Tint, Beltronics RX45/shifters