Thanks to everyone for the warm welcome. I don't know why but emails aren't getting to me from byc, so I didn't know I had all these responses.
It turned out to be moot because the feed store had taken me seriously (I thought I'd told them what I _tentatively_ wanted) and ordered me 3 buff orpingtons and 3 golden sex links. We got them 2 days ago, and they're delightful. Murderous to the bugs we give them, but delightfully murderous.
It sounds like we got a good mix. For the GSL's I think I can tolerate the eggs becoming thin as long as it doesn't mean they all crack and as long as they're edible. And, I was concerned for the orpingtons about the heat as someone said earlier, but the lady at the feed store said they were excellent and do fine here. They're certainly a very popular choice down here. And it sounds like for hardiness and longevity it's good to have a few.
I appreciate all the recommendations, too, but obviously it's too late to change now. I thought we were going to get these after Spring break!