18" vs 20" wheel and tire size help needed please

[davyo]

Yes, I have done a search but Im still a bit unsure of the answer so forgive me on posting this much beat up subject.

With my last H3 I went with 20" wheels and loved them (forgot the tire size I had.
With my new 08' Black H3 base model I just got this week Im between 18" or 20" wheels so I figured I would post my wheel tire goals to get size suggestions.

My goals ::

I wish to raise the height of my H3 as much as possible with my wheels and tires while not doing a lift or a leveling kit or turning the T-bars.

Looking to give the H3 a nice beefy look.

No rubbing.

Want to keep road noise to a minimum and keep that nice smooth H3 ride.

Anyhow, not sure what tire, wheel sizes 18" vs 20", would be best to get me to those goals, any suggestions would be great.
Also, I will be doing mostly city driving with very little off-roading.

Thanks in advance for any suggestions and help.
Cheers
Davyo