I have two PII-700s. One is on the ASUS CUSL2 the other on a Soyo 7VCA. The ASUS board is a lot more expensive, but is also faster. Of course we have entered a point in computer history that everything is fast and you really have to use benchmarks to tell if one system is faster than another.
If you get the ASUS make sure your memory is on the approved list for CAS-2 operation, as it will make a measurable performance difference.
You do not want to have a PIII-700 running at 933 and the memory at 100 FSB (as that is an option with CUSL2).
My2centsWorth!
Good luck