David,
There is an area on the profile page where you can enter your location. It helps us to help you if we know where you live. I presumed from the three compressors you listed that you weren't from "around these parts" as only the Tamiya had a recognizable name.
Tamiya spraywork set:
Looks lightweight, I found a site that showed the compressor itself (rather than the case) and it's PLASTIC (same as the case). I'd avoid this one!
Puma model 6L (MA2006GA):
This one I couldn't find a specific model. I found what I think might be it's bigger brother with a 12L tank, but the model number you specify shows no returns. Puma makes industrial compressors, so this would be one to consider. I would expect it to be a bit noisy!
Werther X1 or X1AS:
I found these at the Jeffrey Stein site in South Africa, so I would imagine this is where you or your LHS would get it. I would go for the AS one with the moisture trap and regulator pre-assembled. If you had the money go for the Werther 2 compressor, as it's quieter.
So which one?:
I would avoid the Tamiya, looks like a toy and I would expect a short life span.
The Puma I would like more information on before I would lay the money down. The tank will help with pulsing. Does it come with a regulator and moisture trap? Will the LHS let you run the compressor in the shop to hear how loud it is?
Any of the Werther's would be good, but the tank on the Puma is a big draw, but pulsing can be overcome by using a 10' braided hose.
See if the LHS will let you operate the compressors and make your decision based on noise and ease of operation.
And what do you have, Bill?:
I have a Husky branded "garage" style compressor with a 3 gallon (12L) tank, probably similar to the Puma. It's LOUD, but as it lives outside of my house, I barely even hear it. I couldn't tolerate it in the same room! I drilled a hole through my hobby room exterior wall and have a short (6') hose to pipe the air inside my spray booth.
I hope this helps!
Bill