I need some new tires, but I never know what to buy or whats best. I have an 04 GMC Sierra excab 4wd. Last set I bought were cooper discoverers ATR I think and I'm pretty happy with them. Thinking I want something a little more aggressive like a cooper discoverer stt or maxxis bighorn. Out in the pasture in the winter I'm always spinning with just AT tires, so I figured with more aggressive I wont have as much trouble, but is it worth it vs on road handling etc. Just need some opinions before I shell out $800 or more.