I would order the new one now then trade on an '18 after the kinks get worked out. Either way, go 2012 or newer to get the better engine. Unless the 2010 is a manual Rubi with 4:10 gears, it's going to be - how should I put this - not the best experience in the world. Case in point: stock Rubi auto against a 25 mph headwind for 10 hours = 11.5 mpg on a trip I took. Anyway, I don't want to bash the pre-2012s too much, but just remember they will seem like you can live with the 3.8 power on your test drive, but it will wear you down after months of ownership.
Only other suggestion would be wait for 2016 as Jeep may do something special the last year. Plus, at some point the '16 and '17 will be on the lot at the same time and your choice will be clear.
But back to the basics: if you buy a Wrangler you win. Just keep that perspective!