Well, I guess we know what you'll be posting for "look what I turned this week" for a while to come now.
Actually, at that volume, running a test batch might be worth it if you have the time. For ex:
1 Artisan (quality) of one color, 1 Zen (quality) of a different color, 1 Eco Zen (economical) of a third color, 1 Magnetic (economical) of a 4th. That way you can get the best of all possible data for your decision.
And as a bonus, if you haven't already worked a price and/or aren't certain of the customer's price sensitivity, you could then bring them to the customer as proofs/examples and give them a price list :
- quality kit in black TI will be $X
- quality in chrome will be $Y
- economical in gun metal will be $Z, etc.
Maybe even toss in some different inks if you think they might be interested in the differences there.
With the finished item in their hands they will be better able to feel and see what they are able to ask for and get.
It's something I picked up from my artist partner. Giving the client 3 -5 rough and fast thumbnail sketches before the final piece really helps the client feel empowered about their choice - and REALLY cuts down on the "but that's not what I wanted" rework.
The other part of that equation is "never give the customer a thumbnail of something you absolutely don't want to do". If any of the kits don't work out, leave 'em off
And... maybe have the numbers ready if they want to mix and match and you end up losing the bulk order discount.
Maybe you will want to leave off the Magnetics too. Their website shows that they have less than 20 of each color in stock.