I got my '04 GT for the same price, but it didn't have Action Package or anything along those lines. That being said, I haven't regretted it. The MSN Auto's price for the car is almost $2500 above that, which sounds a little pricey if you ask me. Long story short: good deal.
As for exhausts, I was actually looking at getting a TRD
myself. Biggest thing is to look around, watch as many videos as you can to get a good feel for the sound, and go from there. All the exhausts are gonna give roughly the same power gains +/- 1 whp from what I've seen, so just find the best sounding one.
That being said...this site offers no shipping costs, but they only seem to really carry Magnaflows. Check 'em out.T Dot Performance