If I had your stats my preference would be the 82nd Airborne. I'm a little smaller at 5'9" so I will be getting the junior model of that in the Air Raid. I am Bowtech loyal though.

If you are dead set on spending under 600 than you might want to check out some of the big box shops like Gander Mountain, Bass Pro, or Cabelas. I know that my local Gander Mountain has a 30% clearance sale on all of thier bows right now but it only has one Diamond Marquis left, normally $699 on sale for $490. That would be a great deal also.

Give yours a call and see if they have the same sort of sale.