Hi all, I've been lurking for a while, but had to give some props to the Pioneer FH-P8000BT.
I just recently installed one in my 2006 GT with the Shaker 500 and I absolutely love it! I wanted a new head unit primarily so I could hook up my ipod. This unit does that very well - controls the ipod from the head unit or the ipod and as an added bonus also has Bluetooth for your phone, which I've found to work great as well.
I only have a couple complaints, one is the with the AM reception. With the stock Shaker 500 unit I got very good AM reception, and now can only pick up a handful of stations? The other complaint would be that it has kind of a steep learning curve. However, once you figure out the navigation it's actually pretty fast.
Anyway it's relatively inexpensive, has a nice factory appearance and works well.
Cheers!
Drew