Orient Express - Cheap Chinese Rims / Wheels / Forks / Frames / Cranks / Etc

I really want a pair of the 20mm tubulars- how many spokes would be needed to keep my 76.6kg from breaking them?

I'd be tempted to go 28R/24F. Thats probably the lower limit though.

You could also beef up the spokes. What's the difference in strength between something like cx-ray's and Alpine III's?

I guess you've also got to consider what the max tension you can get away with on whatever rims you're considering.