I'm talking about without having to do any mods.

18"s on stock suspension but you'll rub when you bottom out

I'd say with a stock setup, don't go higher than 17" unless you are on the best of roads all the time, then like Bambooseven said, you could go 18"

ive got 17's with a 3" drop and rubbing is a BITCH i can't turn my wheel all the way without rubbing kinda gets annoying

15's or 16's on a hatch is what id do