Matt:
Personally, I think there are two major issues to consider:
1) Functionality- are you going to be using this truck as a major run about (DD or long trips) or is it just a weekend get-about with the occasional Land Rover function?
If the later, then I would so go with stock low back seats, as I think while the Series ... much like the Defender,... are like an erector set, ... which leads me to major issue two
2) Personal Preference: As a traditionalist, I prefer the look as they came off the line. When I had my series truck, you couldn't find elephant hyde anywhere. Now it is being reproduced and you can get seats as original, and then there are the "deluxe" seats that are pretty comfy.
Check with Dale on the seat bases. He may have what you are looking for ... shortly.
Dendy