where to start?!
I got a clear MTI lid to replace my blackwing (for looks not performance) and my car already had the SLP exhaust. May I reccomend a MTI lid and a borla exhaust? If you have the money go true duals.
JUST MY 2 PENNIES!
I am sure 99.9% who have actually modded their cars will tell you stall and headers will make the the biggest SOTP diff for first mods. Don't forget a lid either as a first mod.
IM's are overated in my book and are really only necesarry after full exhaust and to support a cam. LS6 IM is only about about 7-10 and FAST (in sig) maybe 15 despite all the hype.
If you are M6 gears are great like BL 744 says and are at the top of the list (4.10 or 4.11). If A4 I would stall first but 3.73's are still a kick in the pants

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. Expensive but worth it. 

