I'm not usually a pie-baker, but I want to do an apple for Thanksg. this year. I like the idea of a crumb topping, but I'm looking for something a little different. I've been thinking about a sour cream apple pie, but all the recipes I see for that call for Granny Smith. Is there any reason why I can't sub another apple -- we like the mccoun apple in pies. Anyone have any ideas for an apple pie with a twist?