Best value for money on aero wheels
Over a 40-minute ride, you may not notice much.

One older reference compares a then-standard 32-spoke 27" wheel to an aero rim with 28 bladed spokes, a high-end hub and an extra-lightweight tire. The estimated improvement over a one-hour time trial at 23mph was 44 seconds - an impressive improvement for racing, but not particularly meaningful for a commute. A more recent comparison by Rolf to the aerodynamic Mavic Ksyrium claims that their $2500 TT85 full-carbon disc wheelset saves 1 minute, 49 seconds over 40km.