williams wheels what to get need opinions please

hello everyone need a little addvice on some wheels my set up is sram rival group, leader 735tt frame 2008 vision base bar wiht r bend aeros. talked with mr williams for a while on the options and am looking at the 30x aluminum 30mm aero rims or the system 58 carbon clinchers. the 30x are $489 and the 58 carbon clinchers are $999. this will be my first tri season and i will be doing at least 3 sprints if not 4. i am coming off knee repair surgery 3 months ago and i am having the shoulder done in a week. i am an ex smoker for about 9 months now 35  about 195 and in good shape right now from all the training i have been doing. does any one think i should bite the big one and get the carbons lol. if i am going to role wiht the big dogs with those wheels i better be able to back it up or i will look like j lo out there lol,,,,thanks shawn m