[cycleguy55]

Something to keep in mind is that a 425 HP 427W is going to be easier to drive than a 425 HP 347W or even a 425 HP 392W. The larger displacement (for a given peak HP) will fatten the torque curve and make it more enjoyable to drive and easier to live with over a long time, IMO - and that means you may be more inclined to take it out and use it more often.

Just my $0.02.