Treadmill Reviews Needed!

My husband and I are thinking about making the big fat investment into a treadmill. Oh. My. Gosh. Do you have any idea just how many treadmills are out there!? And the price ranges! I'm completely confused and desperate for some help. Anyone have a treadmill they just love? Or hate even? Costco has two right now, the Ironman Envision for $999 and the Smooth Fitness 7.1 for $1,499. $1499?? Is this supposed to be a bargain? Help! Please! (Sorry! I'll! Stop! Yelling! Now!)