Thanks OLA_H for the prompt reply!
Yes it's a question of price and also the ET 74 will be my primary board hence spending the big bucks.. The E83 is something the came up to a reasonable price, I have wounder a bit if ET 74 would feel small in gusty up and down 5.3m or 4.7m. Also it's easier to change board instead of re-rig.
I suppose yo could put a bigger fin on the E83 to get more fin drive and more b&j performance , which could complement ET74 well.
Yes, E83 is a 2006 model.