Cougar Mag, having shot an 06 Tribute and owning an 05 Defender, I would have to say that the $200+ difference probably isn't worth it. Don't get me wrong, the Tribute is a very sweet bow and I want one bad but it is just a little better than the Defender. A little faster, a little less hand shock. a little smoother. If money wasn't an issue, I would say go for the Tribute. If you can save $200 for accessories, I would suggest the Defender.
My Defender is set at 67lbs and flings a 355 grain arrow at 298fps. It's quiet, has little hand shock and balances well in MY hand with a 6oz stabilizer.
I wouldn't shoot a Tribute next to a Defender or Allegiance. That will definately push you over the edge to getting a Tribute!

Let you brain think about the money and do the deciding.