RE: Black Ice vs Allegiance...
Really, it depends on what you're wanting out of your bow.
The Allegiance is a fast bow, but (when compared to the Black Ice) you can definitely feel it in the draw cycle. At 70# the Allegiance is much more difficult to draw.
The Black Ice was designed with smoothness in mind. You're going to lose some FPS, but you're going to have a silky smooth draw.
They're both awesome bows; real tack drivers. What it comes down to is what do you want? Speed or smoothness?