X3 wheel choices: 18's, 19's or 20's?

[titanium330]

I'm wondering what size wheels to put on my X3 as a summer set. Does anyone have experience with the different sizes? (ie 235/50/18 vs 255/45/18, 235/45/19 vs 255/40/19 vs 255/35/20) I don't want ride quality to suffer too much and for tires, I will just put on the most reasonably priced set (don't care if they are all season or summer, its not a race car). I would like 19's, but the tires are so expensive compared to 20's or 18's. Any opinions on running staggerd fitment? Will a 255/35/20 fit in the front wheel wells without rubbing? Any info/comments would be great.
Cheers.

[ldsbeaker]

To be totally honest, the biggest I would go is 18", and I would keep them the same all the way around. But this is so that I could get max life out of my tires. (rotation and all)
I can't remember what size wheels I have on my x3, but I'm pretty sure they are 17's. Good enough for me. It's already jiggly enough with 17s! I can't imagine if I had shorter, stiffer sidewalls...

[titanium330]

I think I am going to go 19" and staggard. 18's are nice, but I want something a little more aggressive. I wish someone had one with 19's or 20's in my city.