Best is a relative term.....that being said, I'm using an American made Timber Fatty. It consists of 9 100 watt cob fixtures. I have it configured with 5-1750k, 2-4k and 2-3k fixtures. The color temperature averages out to about 2,500k. That spectrum is not far an HPS flowering profile. I get excellent frost, bulk and weight from it. It has a 3 year real warranty (i.e. the company doesn't dick you around when trying to get something fixed).
You are able to custom configure it to your specifications. The cost including shipping and riu discount was around $1,100.
I owned an HLG Rspec 600 Diablo as well. I preferred the Timber for it's light penetration and evenness of light dispersion. I've got nothing bad to say about HLG. Their customer service on a return was first rate.
In my opinion Gavita's are way overpriced. You won't go wrong with any of the lights on your list. I looked at most of them before I bought the Fatty.
I customized my Fatty by adding this Solurecure UV kit to it.
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