If you are looking to spend 14k, you are pretty much restricted to 3rd gen, those trucks depreciate like their value has lead weights attached to them. The ONLY reason I went with a dodge was because the 4th gen's are so much better than anything else on the road. Their resale value seems to hold steady once it hits about 20-25k. In 2010, my truck was a year old. I got it used, with 42k on the clock, for $21,000. Has every option I thought was possible to get in a truck at the time, except for leather, which I did not want anyway.
Here are some good looking 3rd gen's to get you started:
Link 4-Low Miles