I have been shooting with a D100 since it came out. I have 2 "Pro" lenses the 70-200 AFS f/2.8 telephoto, and the 17-35 AFS f/2.8. My "normal" lens is a 35-85 AFS f3.5-4? I also have a 50 f/1.8 for low light stuff.
The Houston marathone is fun --- I will typically take 6-7000 images in 6 hours. I have taken a bit of a break while in school, but I have shot part-time professionally -- mainly location, family photos (on the beach, at the park, at home, etc). For awhile I was working for another photographer shooting weddings -- she would take the formals at the church and I would finish up at the reception. I also have a friend who is a industrial photographer. Once I got to go out on a bunkering barge that was refueling onw of the Princess line cruise ships in Houston. He also had me out on a ledge on a 40 story building in Houston at 5:00 one morning!
Yes I would like to upgrade. I think a D2X would be nice to take the group photo with!