That L3 unit you linked is legit top of the line. When I worked on this sort of stuff professionally, we used one of those in our optics lab as a reference device for testing prototypes against.
That being said, you can definitely spend a couple thousand less and get something that is like 99% as good.
Call JRH. I bought a Photonis from him a couple years back. It's VERY good and was quite a bit cheaper than the L3
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