Single ring chainset options
 

I've fitted an Alfine 11 setup to my hybrid. Presently I am using my XTR chainset minus two rings. It works great, but it looks pretty naff with those four arms sticking out proud. Yes I could cut them off and file them nicely, that's still under consideration. My question is, who makes a chainset that fits this criteria:

1) Single ring chainset
2) 'Pipe' axle (not square splined)
3) External bearing design
4) A decent, reasonably light, quality unit, not budget quality

Thanks guys.