yes heads, cam, headers with a X.
don't forget fuel injectors, the 28lbs ones in your car already start to lean out at high RPM with just a CAI.
ported throttle body should be on the list too.
intake wise there isn't a ton of improvement with a FAST over the LS6 but if you have the extra money to burn then go for it and you can pick up a few more horse.
the LS6 is not as stong as the LS1 for alot of boost due to the internal passages in the crank case for air to move better. other than that there is no difference.
02' had the upgraded rod bolts that were good to 6800 rpm, they still should be on your upgrade list.
the stock mufflers are Ti and flow just as well or better than most aftermarket systems and weigh less. if anything hang on to them if you go aftermarket.
corvetteforum.com is your friend.