I've got a toss-up between 2 fixed gear cranksets: IRO or Sugino RD. The price comes out basically the same (Bikeman has good prices on the Sugino crankset and BB, btw), so is there some clear difference in quality for those who have experience with these? To put this in context, I'm converting an old beater (Kabuki/Bridgestone). The bike will primarily be for commuting, with a little extra mileage on the weekends. I'm not looking to go high-end (obviously), but my current crank spider is done and I'd like a decent drivetrain.

Thanks.