Tough call. I don't really think you could go wrong with any of them. If you want the absolute "latest and greatest" then the Guardian is the only bow that is going to satisfy that desire. The Black Ice and Tribute use almost identical platforms. The only difference is in the cam design and the subsequent speed and enery storage capabilities.

I have not received my Commander in yet but I look forward to comparing it directly with my Black Ice in terms of shot feel, speed, etc... If money is the primary issue then the Black Ice should get the nod as you have it listed a bit less than the others. If the $50 to $100 isn't that big of a deal then get the Guardian.