I agree with the consensus here that it will probably be awhile (if ever) before 3-D is anything more than a novelty for in-home entertainment. It certainly wouldn't stop me in the least from buying a pre-pro today.

First, there's always external HDMI switchers (I'm using one now). Second, there's always going to be something new on the horizon. If you must be bleeding edge, then plan to upgrade your equipment annually. Third, if the latest in connectivity options is a major concern, a receiver from a major manufacturer is usually your best bet. They typically get to market faster than pre-pro's and have shorter life cycles. Fourth, no way I'm wearing those dorky looking glasses.