I had a FLIR B40 at the day job. It was $5k when we got it, and it was a demo. Now you can get into 120 pixels for around $1800. They still use the same shitty batteries though, and you only get one. If you are going to learn as you go then anything that fits your hand well in the $2-2500 range will be more than enough camera for HI work. There are probably a few in the $16-1800 range that are good enough. Try a few out before you buy, comfort and ease of use are at least as important as anything else mentioned.