I doubt I'll be bothered by the elevation. I'm an avid hiker and frequently camp at high elevation (3000 meters +) for many days at a time. Thanks for the concern though.

This website was very helpful when I was locating the following information:
Roundtrip airfare from PEK-Lhasa (LXA) runs about $600. Hiring a 4WD from Lhasa to the Tibetan border is about $120 roundtrip, and it's a 500km drive. Then I have to arrange a Nepalese visa, and then board a bus to Kathmandu. China also seems to make it difficult to re-enter Tibet from Nepal.

Well, it was interesting to at least look into a trip such as this. Unfortunately It's looking like a trip like the one I just described would require at least two weeks of travelling to make it worthwhile. I'll probably have to plan this trip for a later date. Additionally, I'll be in China on a student visa and it appears that only foreigners on a tourist visa are admitted into Tibet, student and business visas are not allowed, apparently.