Mechanically they're all the same but you know the features for the different trim levels, right? B-Line has no foglamp, driver airbag, electric mirror and alloy rims. I've got the SE version myself and I'm very happy with it. I think the M Line should be good enough for you and most people though, unless you really want the leather seats (more comfy, easier to clean) and stock bodykit (if you're too lazy to fit a custom one yourself, like me). I actually prefer the M Line rims but the SE ones are fine too. It's really up to you, but I think the M Line features are worth paying for, same for the SE version.