Perfect timing: Kirk Pacenti is having a sale on his great SL23 rims. I had been on the lookout for rims to build up a 650B wheelset for quite some time, and so I jumped on this one without hesitation! I'm linking to the silver version with 32 holes that I bought myself, but they're also available in black and with 28 holes.
Edit 4:15pm: Looks like the shipping has been increased. But still a great deal!
Usual disclaimer: If you buy them through this link, I'll get a small referral from Amazon. And now go buy these great rims!