Scott Plasma owners? (1)

Hoping some Scott Plasma owners out there can help me. How much does the seat clamp add to the seat tube height? I’m 6’1" and the measurement from top of my seat to BB on current bikes is 78cm. I’m debating between a medium and a large - considering picking up this L frame from eBay - http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&sspagename=ADME%3AL%3ARTQ%3AUK%3A1&viewitem=&item=330151234047&rd=1

The Scott website says that BB to top of seat tube on a M is 740, I assume the clamp would allow me to get to 780? Current bikes are a 55cm Lemond (sloping top tube) and a 56cm Cannondale (horizontal top tube). Have a bunch of components ready - just looking for the right tri frame to build up.