Originally Posted by
sced
Equals
A fool and his money are soon parted
I feel like that is what the original poster is asking though, is if it would be foolish to get the wheels considering his weight.
In response to the OP, I am not sure your weight is all that relevant here in the decision. One thing to consider is the benefits of carbon wheels are greater at higher speed due to the aerodynamic factor. At higher speeds you will see greater benefits. If you average 15-18mph on your rides, you will see less benefit then if you average 20-25mph on your rides. You should still see some benefit in acceleration though.
I have met plenty of really fast cyclists that could stand to loose 20-30 lbs. I would not make that the reason not to buy the wheels.