What drives me a little nuts is the following:

a) a local camera shop that stocks both units has them for $500-600 over internet pricing
b) that shop may be willing to come close in price but will not match (based on similar experience buying (or trying to buy) Nikkor lenses from them)
c) I'd REALLY like to spend a day with both cameras before biting the bullet
d) internet sellers seem to have inconsistently-applied return policies, and there's always the risk that a return would go wonky

Let me go talk to the local shop...