The longer the warranty, the better the battery. Doesn't necessarily matter what the name brand is as most of them are made in the same 2-3 plants under different names.What's a high end battery? Die hard?
Stay away from Optimas. They used to be great batteries, but moved their production to Mexico I think. Since moving, they've gone downhill.
I run O'Reilly AGM batteries in our Jeeps and cars. Cost a little more, but last longer as well and have high cold cranking amps.
Die Hard Platinum is supposed to be a great battery.
I'm active on a couple Jeep sites. Batteries are a big deal to 4wheelers, especially the guys who run extra lights, winches, etc. That's where the above is coming from.