I second Jeff's recommendation that you wait for DEMA, with what you'll save, you can probably buy 3 sets rather than just 2.
AGAs w/buddyphone were on "show special", selling for below dealer cost.
OTS is the US Distributor, and they also sell direct to customers, something that irritates other dealers.
The black & gold are both silicone, the gray comes in natural and silicone. The natural rubber stands up to daily abuse if you dive them a lot, there are less issues with ripping out the strap hardware with the natural rubber. For the part time user the silicone would probably be preferred, they're a tad more comfy & may seat better.
Factory price of the gold vs black is the same, it's just more demand for the cool military black version.
If you can't wait for DEMA, PM me.