I've had a YT Jeffsy for about 3 years now, it's way too much bike for me but I've enjoyed it!! You'll be getting a great bike, especially for that price!
IDOT has had a couple of these working to repair/secure a rock slide on hwy 55 between Boise and Cascade. Pretty cool to watch them work on a near 45 degree slope.
I've been pretty happy with my 2012 6.7 F-350 over the past year and half (nearly 40,000 miles) or so I've had it. I've usually got a loaded 24' trailer on it once or twice a week and would have a tough time going back to a gasser, especially when being loaded and going up hill.