Yes, for the time being we will be keeping the 5x4 pattern and staying with smaller diameter wheels. Preferably 15" rims. I might eventually change it to the bigger bolt pattern if I put a 340 or 360 in it but that wont be any time soon
If you're keeping the 5x4 SBP and 15" wheels then in the front you're biggest wheels will probably be 225/60/15's on 15x7's. Some have managed 235/60/15's but I don't recommend it.
In the back you'll want 15x8's, and you can manage up to a 275/60/15 with the proper backspacing. What that backspacing actually needs to be will depend on what axle you have back there.