If the price is right, buy it!!
I'm a huge fan of late 90s, early 2000s diesels, Dodge or Ford.
I own a 2000 F-250, 7.3 extended cab with 400,000 miles, and a 2002 F-350, 7.3 crew cab with 120,000 miles.
I just bought the 2002 Ford about 2 years ago and a 98-03 Dodge 2500/3500 would have worked if I found the right one, low milage, clean, and crew cab.
Those things run forever.