their is a reason alot of people say to change your saddle first then your wheelset.
saddle will make you comfortable for long rides
and the wheels are rotational weight. I could feel a huge difference between my 2375g wheelset and my 1975g wheelset (these weights included wheels, tires, tubes, cassette, and skewers) and that is only a 0.88lb. difference but that is ALSO rotational weight reduction.....