I ride my IRO Jamie Roy quite long distances.( anywhere from 50-100 miles every saturday, and about 18 miles every night after work) The geometry's nice because it's a little more like a road bike than a track bike so it's suitable for commuting. I guarantee a fun ride. I would buy the frame and build it up with better parts rather than getting a complete bikefrom IRO. I've found their frames to be solid but drivetrains to be a little cheap. But deffinately get a different lockring than the generic IRO, the few threads they give you will only strip away the hub's with a little hard stopping. I've had the best luck with Shimano Dura-Ace lockrings. There are threads a plenty and it will only set you back a few bucks. It's a whole lot better than rebuilding a wheel

Get yourself an old road bike with horizontal drops and buy a fixed rear wheel or blow a wad on a new bike. Given the choice, (no offense to anyone, just my preference) I'd go the Bianchi before a Redline or a Langster.

But why would you want to run a singlespeed on a track?