You can put a lower watt bulb. I use a 45 when there are just a few.Pullets mean eggs quicker. But slower to bond. Chicks take longer.. but you get to bond. Chicks means possible rooster.... There's pros and cons both ways.
I like getting chicks because it's easier to quarantine chicks (they're in a brooder anyway). And they're cheaper.... and the kids love getting babies.
You're only getting two though... running a heatlamp for two chicks may be a little silly. Harder to keep warm.
My chickens sneak in the doggie door too. I had an EE hen sneak in really early one morning and wake me up for snuggles.Mine orpingtons were very friendly like dogs. They would come when I called. Sit on my lap and get petted. I've even taught them several tricks using the clicker. What drove me mad about those chicken is when I let my dogs go outside to potty. When they come in the house the chicken would try to come in with them. Had to kick the chickens out all the time.