If I were to own a G for me, it would be just like Steve Smith's- a perfect G-Klass IMO.
I love Steve's truck, it reminds me of my old 300GD which was also white. Mine had the tropical roof and is now with a new owner in Bend, Oregon. The main drawback of the 300GD is the lack of power. To go from the stock 29.5" wheel to a 31" is a significant drop in available power, 33" is like learning to crawl, unless of course you elect to do the necessary R&P change.
Unfortunately you are left with a diesel G that moves a little better but has long stopping distances. Perhaps there is a cure for that as well.
All modifications come with compromises as we well know.
The G500 can be modified more easily due to the depth of reserves available both in braking and power. A switch to 33" tires from 30.5" stock is not really noticed. Braking is also unaffected and power remains adequate. Many 300GE and G320 owners look to R&P changes after going up in tire size. Ask "Fernweh." As for the Brabus G36, I have test driven one prior to buying my G500, but do not have much knowledge of them outside of that brief ride and reading about some wiring harness issues.
The '02-'03 G500 have been much maligned due to some quality issues that are primarily related to non essential items, but these have been well sorted. Service and parts are more readily available than for a grey market vehicles like a 300 GD or a G320 with the 3.6 motor upgrade as previously mentioned.
The 300GD mechanical simplicity is tempting, I was once a
diehard, but for mountainous or hilly road driving it is not at all practical and the fuel economy is not much better than a G500. I averaged 15.4 MPG on a 200 mile mellow weekend trip to the Oregon coast a few days ago. I averaged 17-18 MPG in my 300GD.
While the 300GD is a great hobby car like an old LR or TLC, the G500 combines the best of both worlds - modern automotive technology with Mercedes Gelandewagen capabilities. The G320/36 is a great car, somewhat unusual, and is nice to see in the OJ features, but putting 5K into it that you will never see back would be pound foolish IMO.