Sunny,
I too keep mine fairly stock. I have the ddm backbone, a tune and heated seats... Otherwise stock. I would suggest bracing as a good investment as it makes a noticeable difference, but is outwardly undetectable. Better brake pads are somewhere in the future, along with some better rubber and some wheels that showed up on my doorstep one day last year. Other that that, it's deciding whether you want to change looks or performance. Either way, i'll be at the meet to lend you a hand.
GJ