Sounds like a great ride. Nothing better than putting big miles under the wheels. Glad you were pleasantly surprised with the XT. A couple of mates and myself are planning a ride from Vladivostok to UK in 2013 on 'old' 83-86 XT600s. Mine's a '83 Tenere, the other 2 are XTs with larger plastic tanks. We've 2 years to strip the bikes right down and replace all the dodgie bits.
The Tenere seat is supposed to be good, but I'll be throwing an airhawk and a dead sheep over the saddle just in case. It'll be around the 25,000km I guess.
We're still debating hard verses soft panniers, who's going to be in charge, west to east or east to west and a million other issues. We're all fairly 'senior' and my wife thinks we all mad.
We're all from Oz and live in Melbourne
We did a ride from the IoM TT in '08 to Damascus and back on eBayed XJ900s. Did around 17,000km in 7 weeks.... sheep skin worked great.... mainly to keep the saddle cool when we were off the bikes. We all paid no more than 1000 quid for the bikes, incl. the panniers and apart from an oil change in central Turkey, no issues, not even a puncture. here's a blurb re the trip, if you're interested. One of the guys is a journo. http://smh.drive.com.au/bike-news/ride-of-a-lifetime-with-no-backup-20110524-1f163.html
cheers