I use a top crust, i've done the butter thing. I don't have any particular type of apple i use, because i'm experimenting with different ones, till i find one that has decent results.
I have some bags of apples that came from an orchard yesterday, they're red, but i wouldn't call them Red Delicious. The orchard owner wasn't outside, so i didn't get to ask him. If i'm not mistaken, though, a lot of their crop will go for applesauce.