Just FYI, the 2012+ has a different engine and transmission and does require different gears than a comparible 2007-2011 3.8L model. Previously DAK09 was quoting "performance" gearsets for a 2007-2011 JK with 35" tires. Consult the 2012+ (3.6L) charts for your regear, it is confusing at first, but best not to get mixed up between the 3.6L and 3.8L when choosing to regear your JK.
OK now to decide for 17" or 18"?? pro and cons please, other than $$$ ??
Probably just personal preference between 17 or 18s...
I personally prefer less wheel and more rubber...thats typically better for offroad and it gives it more an "offroad Jeep" look...however 17-18 really wont make a huge difference. The 18s will cost you more obviously and the tires for the 18 will probably be a few bucks more...as far as tire availability anything you want would probably be available in either, so thats a non-factor.
Personal preference really!
2013 Commando JKUR - bone stock
You really shouldn't "Need" to regear with the '12 unless you are planning on doing some pretty serious rock crawling and you want the lower gearing like a Rubicon. For anything else, the '12 has plenty of power.
It's completely personal preference though.... Don't worry about it yet, it's not going to be an issue.
Beadlockers are very specific purpose built rims and may be illegal in your area, check your laws before going with them. I know in Utah, there is only one style of beadlocker that's legal on a regular street vehicle.
Make a man a fire and you keep him warm for a day....Set a man on fire and you keep him warm for the rest of his life....