Decide on what you plan to do with the JKU, then see if you can find a good price on an improved model with more "stuff". I started with a 00 WJ, which had 165K on it, then traded it 3 years later for an '11 JKU Rubicon 'cause the engine and gears were shot on the WJ. I go 4x4ing about twice a month and once or twice a year I spend a couple of weeks off-road. Since I live in New Mexico, we have a lot of areas to go off-road. Some trails are for beginners (rated 1-3) while others are for very advanced (up thru 10). The local 4x4 club has events for all levels so we get to learn and improve.
Decide what you want to do, then decide how much money you can afford to spend to do it. For example: daily driver (DD) or weekend fun, bigger tires, lift, skid plates, other enhancements. Some start with a basic model, then upgrade (over time) to where the are running with Dana 60's and 4" lift, and 37" tires. All of these items cost and each change may result in other costs (new steering, tie rods, coolers, etc.). Just think about what you will use it for, then decide on the model & year. ALL Jeeps have issues, some are worse than others but all are fixable if you want or have the time. The difference between a 16 and a 12 is not that much, but some of the early problems were resolved between the '12 and the '14 models. Check here and on the Jeep Forum - Jeep Enthusiast Network
for other information. Good luck!