Welcome to the forum
Congratulations on making a great vehicle choice
I6's are very strong engines that last quite a long time when properly maintained so if you find one with higher miles, don't let that scare you off, if it appears to have been taken care of. 200k+ is normal for this motor with proper maintenance. Keep looking, you'll find an I6 that will make you happier than the 4banger will. Someday you just might want to drive it on the highway, to college, or work or even to move away from home...
And once you own a Wrangler, you'll always want to own one, so you might as well start with the best, and keep it, rather than be looking to upgrade in a year.