If it's still in production use, go take a look at it. That's your best bet if you haven't had one before.
Still, around $5k for a working LT is a pretty good deal. You can find them for less, but they have usually been broken for a while when you hit the $2500 range.
FYI, if an LT needs all new heads, expect it to cost $6000 (around $1k per head) plus labor to replace. That's where the savings come in with the ValueJet. Other than that, it's built like a workhorse and damn near hard to kill (although I've seen people try pretty hard... like a hole in the ceiling raining on a running machine, not once, but twice in a row.)