Originally Posted by Retro Grouch
Also, the shifting aids that make the Shimano chainrings more expensive add no benefit on your single ring set up.
Good point. For what it's worth, the cheap Nashbar rings include such shifting aids as well.
If you want singlespeed-specific rings, Surly makes nice steel ones, or find some old pre-Hyperglide ones from the eighties, or look for track rings. But frankly I think there's no reason to do that, since I've never seen any evidence that multi-speed rings throw the chain more or anything like that.