I was just starting your thought process 'am I going to really get advantage from deeper wheels?' No one here has also eluded to the fact that if you are a fast athlete you will get greater advantages with a deeper front purely based on the fact that aerodynamic benefits become greater with speed. So depending on you bike prowess gains may not be so great. If you really want a deeper set then do it but who knows a good set of tubes and tyres and a aero helmet or a good tri suit may net greater gains and be cheaper.