The beauty of the GX - it's capable as heck in stock form, can easily be made better, too.
If you want bigger tires, note that the wheel wells are pretty tight, even with lift, you will have to trim, especially if wheel travel is stock (i.e., most all spring lifts still utilize the stock travel).
I have had mine a little over a year. I did 2" suspension lift with airbag delete, Dobinson's springs and shocks all around. I have 33"s. I got the wheels and tires clearing pretty well, so there's no rubbing on day to day driving. Under hard articulation, the fronts will rub no matter what you do. I have wheeled it in a lot of pretty tough trails, but I do think I could have wheeled almost all of them in stock form, too. It amazes me what it can do without lockers. As you know, though - lockers can be a game changer, but they are spendy. So do it only if you need to do it to accomplish a goal.
The thing I like about the setup I have is that it rides super compliant on road and off - the slightly taller wheel absorbs bumps a bit better than factory size. This makes it nice on road and off, and the Dobinson's springs are well tuned to your need (they have mutliple weights available, depending on what you're looking for).
So yes - to echo what everyone else says: How do you plan to use it? What's the goal? Start there and work your way backwards.