I don't think you can beat the deals they've got going on right now??? The benifit to waiting, however, is you may have more model options to choose from. Aside from that, some dealerships will not take your current sled until fall (6 more months of depreciation), or they may not take it at all???
That being said, I'm 6'-6" and 250 and I absolutely LOVE my Attak GT, which I DID NOT spring order - except I could use taller bars for standing.
They're all great models, but my preference is the longer tracked Attak & Attak GT. "Trail versatility" is what they are designed for.