Its not crazy to go SS I actually considered it a a few weeks ago. I decided to stick with gears just because if I pull a trailer they come in handy. Also the single speed bike's frame I had wasn't commuter friendly. My current backup commuter is a SS folding bike. =) The Bikesdirect SS are so cheap I kinda want one, but I don't really have a use for one plus I have a SS frame I should build up instead and I think I already have all the parts.