I think a lot depends on the temps your animals are experiencing when you bring them up. I tend to bring my up to around 78 degrees fairly rapidly, but I still give them a week before I try to feed them. Generally I feed a small hopper mouse the first time around to get the digestive juices working again.
Anything that might be a bit on the smaller or thinner side, I would likely give a large fuzzy mouse to.
If I had rats available, I would probably use fuzzy rats for the first meals.
Darn, it is that time of year now isn't it......