I'm looking to buy a thermal or NV scanner, but I have no idea what I should be looking for. I don't want to spend $3,000 or more on one, but I also don't want to spend $500 on one that is useless. It will be for coyoted hunting. My plan was to use the scanner to locate and track them until they got within shotgun range, then use a kill light. Should I spend the extra money on thermal, or would NV do what I need? Also, are there any recommendations for specific units?