The MGA combo tees that I and most of us play are 5800, 67.9/121. It's slightly short based on the 5i x 36 and driver x 27 suggestions. But I like it. I get to hit several short irons per round.
Everyone here thinks the ratings of the MGA tees are too low. When I compare to other courses I've played a lot, I definitely agree.
The rating system gives a lot of priority to distance, but much of our trouble is on the approach shots. The tips are 7000, 73.6/133. They have the same difficult approach shots as we do from the MGA tees. Well, except for the par 3's. Even on those, the long hitters are using about the same clubs as I do from the shorter boxes.