Unless you are a production company working under contract with a rider that specifies certain fixtures or name brands, I can't believe the average consumer client knows or cares what the difference is between a Martin/ADJ/Chauvet/Blizzard or some cheap Chinese knockoff fixture anyways.
As long as they are bright and look good so everyone goes "ooooohhhhh, aaaaaaaahhhhh" then you have succeeded, and no matter what the name is on the fixture it should have little to no bearing on the price you can charge.
If it does then you are not marketing properly.
Don't we all tell our clients that we only use professional "concert grade" gear?
Martin is quality no question, but again unless it's a contracted rider, it should have no bearing on what you can charge the average consumer.
Unless your goal is to become that production company that goes after those brand specific contracts, then what brand you buy as a business decision will have to be made solely based on initial cost vs life expectancy as it will not generate you extra revenue just because you have that $5000 light instead of the $500 dollar light, all else being equal.
The Chauvet spot 150's by all accounts are nice movers (and really quick too), and would be great for smaller gigs as they are pretty bright but if I was seriously going after the higher end Mitzvah market or was looking to buy something I could grow into and therefore get maximum ROI out of a sunk cost, my reccomendation would be to get 50-60 watt LED's with interchangeable rotating gobos to put custom monograms into.
You can get some pretty compact movers in that brightness range now that wouldn't take up much more room in your vehicle than the 150's.
The brand is up to you based on what I have said above.