As far as what to avoid, I would recommend steering clear of the AFM engines in the 07.5 and newer. If you do find an AFM model make sure you get a complete service history. The V6 should be fine in any year range if you can live with less than V8 power. My personal pick is the 2000-2007 classic body style. All the powertrains in that range are very reliable and the whole truck is so beautifully easy to work on. Also if you want a manual trans thats the last design to offer it.

James Kuhns
Owner/Technician
Auto Tech Solutions
Chatham, New York, USA