E46 325ci wheel fitment advice needed.

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So today is wheel and tyre day, my god what a difficult decision it is. First dilemma, 18" or 19"?? then we have staggered or square??, offsets, tyre width and profile?? etc,etc.

Ideally I would like a staggered set up, would like 19's but would the ride suffer as a consequence of this?? But and it is a big BUT, offset. The info on Google is endless on the subject of offset for the E46, however there is no real definitive answer. My current MV1 set up is a staggered fitment, 8jx18 et47 and 8.5jx18 et50 I believe.

So a little help is required.

Firstly if i were to stay with an 18" staggered set up what width's, offsets and tyre sizes would fit straight on without and mods or arch rubbing issues??

Similarly if I went up to the 19" staggered set up what would my options be??

Suspension is and will remain stock M-sport and I have no intention of arch rolling or any other body mods, just looking for something that will bolt straight on.

Thanks in advance.