ok, here is my .02.
The teg bodies are pretty light, the most heavy part on the chasis being the bulky oem hood, which you have already taken care of. So i would not waste more money on anything but minor lip attactments (if you are really concerned about the asthetics, although the teg is a beautiful machine). Spoon, mugen are few of the brands which i think make both front and rear lips.

Also remember that the stock bumpers have been tested by car companies numerous times beofre they came intot eh market. I would think twice before spending all that money on something mundane as a cf rear bump.

hope this helps.