Typical size for a guy is around one inch. You should have a little excess skin, yes? If so, it shouldn't be too tough for your surgeon to trim the areolas to an appropriate size (unless your areolas are really big right now). The puckering will smooth out eventually.
You might need a revision to get the nipples decreased, though. A lot of guys who get peri and keyhole wind up going back for revisions, but I'm not sure what the most popular reasons are.