Join Date: Apr 2007
Location: Munising, Michigan, USA
Bikes: Gary Fisher Hodgepodge 26er Rigid
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When Rockshox says "80/100", that means you get either of those, but nothing in between. When you see "U-Turn 85-135", that means you can dial in whatever travel you like between those two endpoints.
I believe the term "all travel" is Sram's way of saying that you can't adjust the travel like you can on a u-turn fork.
You definitely do not want to put a 135mm fork onto a frame designed around a 75mm fork. You would muck up the geometry by doing that. However, it should be no problem to go from 75mm to 80mm. You do have some room to move up or down a bit, just not by huge amounts.
And perhaps most importantly, a Tora would be a huge upgrade over a Suntour fork. A Tora 318 air fork at 80mm travel would be an excellent choice, and would cost, I think, in the $250 neighborhood.