I did the Tough Mudder last October (Wintergreen) It was a blast. We took our time, didn't worry how long it was taking us (4 hours). You'll have a blast at the Warrior Dash. A few of my friends have done it and loved it.
If you're ever looking for a good training schedule check out
Hal Higdon's website (not a porn star, I promise). That's what I use for my half-marathon and marathon training. He has training for all users from 5ks to marathons.