ABSOLUTELY get the Pro version. It introduces 3 major improvements:
1. 100/133 jumper removed
2. jumper added to allow vCore over 2v
3. fsb adjustment in 1 MHz increments
The Pro version will be the ultimate KT133A motherboard, combining arguably the best board with the only feature it really lacked (1 MHz increments), and adding the highest vCore support without the need for a voltage mod.
I planned to buy one before I decided to go with DDR.