The thread you posted right on top of addresses this very issue: http://www.bikeforums.net/showthread.php?t=378703

The monocoque Birdy is way overbuilt, as is the Moulton. Both would need adjustments to the suspension (Birdy: green rear elastomer or custom if you like the ride stiff, solid front). Bike Friday will do a custom build and they are also probably overbuilt. That said, at 6'3"/280, I would feel more comfortable on a custom Friday or a Moulton than any other bike if I were you because of the seatpost length.