Thanks for the advice guys... I'm embarrased to say I never knew anyone even made telescoping seatposts. If I can get this frame cheap, I think I'm going to be pulling the trigger.
The frame is actually an '01, not an '03, which is when they started using that stamped upper frame on the Enduros. This one has longer travel which I like. This seems to be more or less an "all mountain" frame before that designation was popular.