I think the $1500 seats are the 996 GT3 seats, I've had my eye on them too! These are the ones with a "cobra hood"-like flare, right? The openings for the shoulder belts are round and should not be split by a bi-secting piece.
The 997 GT3 seats are different, more like what they put in the CGT.
These are the Club Sport Package seats that are available to our friends overseas. For us, we have to order the 1/2 cage and seats separately...
Here is a pict of the new 997 GT3 seats: (PLEASE NOTE, THESE ARE NOT THE NEW GT2 SPORT SEATS THAT THE THREAD IS TALKING ABOUT)
From what I understand, these new seats are crazy $$$.
If I'm wrong and these cost of the new sports seats is < $2000, I'd have to seriously consider delaying my Cayman order!