Racing, or cruising?
Forget a big genny for cruising - go for an asymmetric, since you are seldom hard on the wind while cruising, and once you are 70 degrees off the true wind, the Asynetric is the better sail.
If racing, I would get to know the fleet over a few races, get advice, then buy. A lot depends on local conditions and fleet rules when racing. A big genny is for getting to the mark fast in light air. To carry one as the wind pipes up takes substantial rail meat. Do you have such a crew?