I reckon big tents are where the real scope to economise on features comes in. They're all going to be reasonably waterproof and have enough space, and packed weight/size is (within reason) not usually an issue. So it comes down to who's using it, for what, and what layout of inner compartments, zips and so on works best.
I don't get hung up too much about speed of pitching, but am aware that pitching large tents can have similar effects on one's level of marital harmony to riding a tandem, so you may want to avoid anything with too many colour-coded poles or Krypton Factor brackets.
I agree with Butterfly about the ground sheets. I grabbed a smallish one (about a third of the non-sleeping area of our tent) for £1.50 from Asda as an afterthought, and that worked quite well as a halfway point between shoes off in the sleeping area and wet grass between you and the tea. If you're going to be serious with groundsheets, then a soft brush to chase away the grass would probably be handy. You could lend it out to Hilleberg users for cleaning their zips...