I'm building up a trek 520 frame to use for commuting/errands/touring- pretty much a car replacement whenever possible. I know everyone here seems to live by the brooks saddles, but are they practical for shorter rides as well? My ride to work is short (3 miles) and I will only carry 10-20 lbs. I understand bike seats are difference for everyone, but what is a good versatile seat. Could I go with a good racing seat? The 520 comes with a Race Lite Lux seat- why?