Try to find a used L3 MTM, you should be able to get one for $2500-$3000. That will get you a quality rugged thermal. Then save a little more and get yourself a PTS233. It’s actually a very decent unit for the money.
That would be your best bet to get both for $5K and not end up with junk.
Or if you want a unit that does both look into the M300W. If you call around you can get one for not a whole lot more than what you’ve already got saved.