KEEP IT STOCK......2014 was the last year of Gen 1,and agree,they will go up in value if kept in good condition,mine has already increased.I do consider mine "Stock" because work was done by SHELBY...and all I've addede is Driving/Fog lights in bumper and a Tonneau cover.
If your going to real beat on it for work or play,not really going to matter,so modify away...but if keeping for long haul as the best damn truck ever and a daily driver going off road once and a while like me....keep it stock...
Maybe do the Exhaust...even Wheels...easy reversals...just remember to keep EVERYTHING you take off it.....
This comes from a guy who still owns his High School car he bought in 1973,a 1963 Corvette....47 years,and has a shop full of parts from its history...its gone from mild stock to wild street racer (Dual Carb w/Blower)...but I never touched the body,or interior,changed engine out 3-4 times depending on my mood or going thru 2nd childhood...but now,it sits in Garage and you would be hard pressed to know its not a 2-3 year old used car.Totally back to the way it came from showroom...not going to win Bloomfield NCRS Top Flight Awards,but have won 6-7 in its history...
So.....after my rant.LOL....STOCK would be my choice...if you want to play with mods and can afford it,buy a 2012,2013 and go at it..!