Your comparisons are somewhat trivial and the results are not something you should assume "the best setup" for yourself.
DSS is the only backplate out there that I can see that offers something unique. I don't own a DSS backplate, but I have considered buying one. Pricing was an issue for me so I went with a Hammerhead backplate. Backplates are pretty much the same otherwise.
If you really are unable to come to a decision based on all the information that is already out there, I would suggest you buy a backplate and a webbing harness from who ever you prefer and then network with some other divers and clubs to see if you can borrow a few wings to try. Test a DiveRite wing, DSS, Halcyon and an Oxycheq and whatever else you can find. Then you can make a decision. Since you live in California it shouldn't be too hard.
Myself, I have 2 Oxycheq wings. I like them. I don't know if they are the best, but it does what I need. I recently borrowed my friends dual bladder Deep Outdoors wing, it worked too...I can't really pickout something that made my diving better or worst. My friend has an Oxycheq and a Halcyon wing. Short of prefering the shape, he can't really add any thing to the reasoning for the purchase.
Buy what you can afford and focus on being a better diver. The equipment is only a part of it.