I PMed you contact information.
We got the longer Haskel model 59025-7, in case a seal leaked, it kept the butane and air chambers separated. Price delivered UPS Ground is $2,565. They have two cheaper models, one with the same pumping capacity, but without the separation.
A big consideration in my selection, is that I am not building this for my own use, I will be selling this as a system, and can't put anything in it that is not certified for the application, whether it works or not. It will go into a commercial application, subject to stringent scrutiny by local fire marshals, OSHA inspectors, and insurance underwriters.
I would be happy to discuss the pump environment with Reftek, and help them refine their pump for this market, if they will certify it for our application.
Any pump manufacturer who wants to take center stage in home entertainment, need to both offer an oil less unit that performs well and is certified for the application.