I am on my 4th offroad vehicle, so I have learned a few things over the years:
1.  Until #4, I have overbuilt each one- they have ended up as heavy, expensive, lumbering gas hogs.  I have had to carry fuel to make up for the poor gas mileage ... adding more weight by means of extra sub tanks and cans.  I promised my wife I would not do that this time.  JKUR with 3" TF lift, aluminum skids, 35's ... and I stopped.  I am close to factory curb weight.  I see the AEV and think 2 things- fabulous engineering and heavy gas hog.
2.  Factory is usually best.  The systems that I have had the most trouble with are the ones altered from the factory.  I now firmly believe in the "if it aint' broke I better have a good reason to alter it" train of thought.
3.  Keep it long term or consider resale value.  I will wear out a Toyota so I dont really care what it is worth, short or long term.  I plan to get rid of a Jeep at 100k miles, so resale is important.  Is there really a robust enough market for a 100k Jeep or would I take a bath trying to sell it in a few years?  Likely, the latter.
4.  Invest in appreciating assets, keep the costs of toys that depreciate as reasonable as possible.  I know that does not fit with Scott's "ultimate" definition, but let's face it, most of us also want to make the mortgage payment.
5.  The more I pay for a toy, the less inclined I am to use it for its intended purpose.  A new expensive mountain bike gets babied, my 2012 JKUR never saw a "tough" trail for a year or so.  If I had a 100k AEV, it might never make it beyond the mall.