Spent 8 wonderful years on the mighty 744, you'll love it. Maybe some guys will be a pain in the rear, yes the long sleeve types do exist but they are few and far between and you'll find out who they are in good time.
After that you should come to the 777, best damn aircraft around CX. Naturally I'm biased but 99% on F/O's I fly with agree, even the ones that came from the bus.
At the end of the year we will seriously ramp up S/O training on the 777 for the arrival of the 300ER. So maybe you could join on the 777 as a S/O?
Enjoy