I've never had a 7mm magnum, of any persuasion, but I own/owned other .284" offerings and it continues to be my favorite "metric" bore diameter.
I've never had a .25-06 or .257 Wby, but again, I've owned other quarter-bores.
I've never had a short-mag of any kind.
I've never had a .35 cal of any kind.
I've never had a .270 of any kind, either, but I really don't want one.
I know this isn't the handgun section, but I've always kind of wanted a .38 Super.
I think a .35 Rem in an XP-100 would be neat to have, as well.