Hello MobileNissan,
If you are otherwise happy with the Geolandar A/T G015, consider bumping up to a 285/70R17 or side-stepping to a 235/80R17 for a set of GoodyearWrangler Workhorse HT, or sticking to OE size and checking out the Continental Terrain Contact A/T.
The GeoAT's and Contact A/T are on the lean end of AT tires, and the Workhorse is on the aggressive end of HT tires. Expect similar traction in most conditions. In either case here we're talking E1 LT tires.
If you were running the SL version of the Geo's, these will be a step up in sidewall durability and weight, if you were running the LT version, then these will be pretty similar in terms of strength. If you're getting 30-35K out of the Geo's you'll probably get closer to 45-50K out of the Workhorse and more like 55-60K out of the Contact A/T's.
Otherwise if you want more aggressive AT's, the Discoverer AT3 XLT, Dynapro AT2 Xtreme, and Bridgestone Dueler A/T Revo 3 are worth a look for reasonably quiet A/T's that have more life in them that G015's. Some are available in both SL or LT.
Keep in mind that the sidewall strength of an LT HT tire is probably better than an SL AT.