A stock TC6 or 6.1 will be plenty competitive here in Houston out of the box. The only musts that I would advise for is a spring set, a fan for your motor and some RSD bladders. Other items are tuning options but not a total must have.
If you need some help with your TC6 and want to see your options, see me at M&m tonight or possibly Mike's this weekend. I will be more that glad to help.