I'm in the middle of doing some radical changes to my VX which I'll post pic's of when complete but my problem at the moment is which way to go with wheels and tyres.

I currently have a set of 285X75R16 BFG ATs for road and 275 BFG MTs for offroad. I want to go bigger but is it better to get 15" rims and stick on 35X12.5s, or even 37s I've now found, or should I look at 18" rims? I'm looking at either more BFGs or Kumho 834s or Hankook RTO3s. I'm after the big tire aggressive look but also want to make sure they're usable off road in what is usually muddy conditions. I've got a 3" lift and no cladding issues.