I am riding a set of 2004 Ksyrium SL wheels that have served me well but at just over 1600g they are heavier than some of the custom offerings. Is there anything about the Ksyrium design that makes them a better wheel than a set of custom built wheels with all the best parts? There are some custom built wheels (you choose the hubs spokes and rims) that are under $700 and in the 1200g to 1300g range. Will I regret selling my Mavics for these backyard wheels? The SLs are good and stiff and have never bent with my 200# on top of them but lighter wheels would be nice....hmmmmm......?