I'd say go with your gut. It may also help to get one from a good breeder if you do have concerns (and the local ones were too pricey). Inland Reptile has some pretty affordable jungles right now and he has impeccable records and stock. He has jags too, and I'm sure would tell you if any were showing neuro, etc.
There is a virus going around in carpet collections right now (can't remember the name of it) so you may want to be wary or hold off a bit and see how that goes. I've read that it is pretty widespread and has a lot of carpet people scared, as it has been found in many collections, can be symptom-free for a long time and then become fatal. I want to say it leads to chronic respiratory issues, but I could be wrong. Maybe some of the other carpet owners can chime in and remember the name of it.