i wouldn't bother averaging d3 and d2 since it varies too widely. d1 is definitely upper level. i would prolly say 5.0-6.0 since you kind of skipped the 5.0 range lol.
but just like everything else, you're ability to play at the school depends on the school you choose. so why don't you put up some names of schools and more knowledgeable people can give you better information.