I'll echo several recommendations here about modifications that I'd readily do again:
1) ARB Locker--huge improvement in traction
2) Tires--quality tires pay you back in performance
3) Tire repair tools/ kit.
While the first two aren't considered "cheap"; I would consider these as being some of the highest in value.
Good mods, but the most bang for the buck that I have got cost me about $25, which was my storage system I built to store all the crap that gets me out of the jams I get into!
In it, I keep tools, fluids, food, full trauma kit, JB Weld, straps, tire repair kit, 4 ton come-a-long, bivy, dual battery setup, camel back, hiking boots, iodine, zip ties, twine, highlift accessories, winch accessories, and an emergency bottle of Jack on road trips! :ylsmoke:
Other mods have helped get me out there. This mod has allowed me to get back of something breaks.