I want to put a new fork on my older Santa Cruz Superlight. I had an 80 mm SID on it when I built in new in 2000. So now, 80 or 100 mm? I'm not so much worried about handling or geometry changes. But what advantage could there be to using an 80 mm fork? I've got a Carbon RUSH 100mm for my primary bike. Is there any logic to wanting a 3 inch travel bike for a racier feel and the 4 inch for more general trail riding performance? Thanks for any help?