JR, welcome. My thought is to not give too much weight to "personal preference". THX and other investigators determined that 80Hz was a good compromise; being high enough to take a significant load off of the speakers and the amps driving them, yet not so high as to be easily localizable. Unless there's a specific problem(e.g. speakers that don't have reasonable response down to 80Hz), the suggested 80Hz crossover isn't likely to be improved upon.
If you haven't already done so you might also read Alan's article on bass management in the Axiom newsletter that came out this afternoon.
