DT Swiss PR1600 Spline 32's. List price is $735, but you can buy them from some european websites for less than $500. 18mm internal width, 22mm external. Most 25's will fit without excessive light-bulbing. Most 23's will fit quite nicely.
I have an archived German language Procycling Magazine velodrome wheel test where the Splin32's hold their own against a variety of 40-55mm carbon wheels, and were only 7 watts off a pair of Roval CLX64s and Swiss Side Hadron 625's at 40kph. If you're interested, PM me and email address and I'll send you the .pdf.
If you prefer a custom hub, you can get just the rims (DT Swiss RR511)
"They're made of latex, not nitroglycerin"
I have an archived German language Procycling Magazine velodrome wheel test where the Splin32's hold their own against a variety of 40-55mm carbon wheels, and were only 7 watts off a pair of Roval CLX64s and Swiss Side Hadron 625's at 40kph. If you're interested, PM me and email address and I'll send you the .pdf.
If you prefer a custom hub, you can get just the rims (DT Swiss RR511)
"They're made of latex, not nitroglycerin"