I vote front beam, too. As crew, that's where I am when the boat rights anyway, and I'm always concerned about getting aboard and getting control as quickly as possible. Seems like swimming to another part of the boat would take too long. Like Steve, I also use the dolphin striker like a ladder - get out quick, though, because once the boat starts moving, it seems like the drag makes it exponentially tougher to claw your way back onto the tramp.
'Course, you should consider staying dry to begin with... KIDDING! I think if you're not getting wet, you're not pushing hard enough. Even the pros get wet once in a while - I'm a witness.
John