Ben,

Do you have a depth or width you are specifically looking for?

I'm not dead set on a particular width or depth. More surveying the options. That said, given that these will ultimately end up on my road bike, a depth in the range of 45mm-60mm and an internal rim width of 20mm +/- 2mm is probably the general range.

Bontrager Aeolus 5 TLR, Easton EC90 Aero 55 and the Roval CLX 50 are all tubeless compatible with external rim nipples. They are all the fastest wheels in the world too, how convenient?

I sold my full carbons because I was so tired of horrible braking and swapping pads, but the wheels I'm on now don't meet your external nipple criteria. After seeing a 32.5mm aluminum rim (meeting your other 3 specs and close to your dimension wants) look pretty good in a 3rd party tunnel test, I think they could be replacing the Ksyriums on my road bike. That's a pretty nice option for 1/2 to 1/3 of the price of the wheels above at very similar or lighter weight. The black ceramic coating gives it a nice look as well.

Take a look at Nox Composites (http://www.noxcomposites.com/). They have two road rims, the 36D and the 36R (Disc and Rim, 36mm deep. Inventive naming convention, huh?).

I can't speak to those rims specifically, but I have two of their wheelsets (27.5 all mountain rims on my hardtail, and their 29er lightweight racing rims as my CX race wheels) and I am very happy with them. It helps that my shop has a realationship with them and I got good deals.

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Any run that doesn't include pooping in someone's front yard is a win.

Just bought some rims from Nextie that fit that description. Hoping to have them in the next few days.