While the stock C6 shifter is functional, it's not what you could call stellar when it comes to being a real performance shifter. The best aftermarket shifter I've come across for manual-transmission C6s is the one made by MGW Ltd., and it's a real precision piece of equipment (the company's excellent C5 performance shifter is similar in design and function, too). Installation isn't difficult and, even if you've never done this type of work before, you should be able to complete the whole project in less than two hours.
Small flat-blade screwdriver
No. 15 Torx driver
7mm and 10mm nut drivers or sockets/ratchet
Loc Tite Red thread locker (optional)
Time required: 1 1/2-2 hours