Snodge,
We scoped out that gully. It would definitely be much longer and perhaps more interesting to climb. I'd love to go back sometime and go for it.
We opted not to hit it because there appeared to be a thinly-covered section midway up (notice the brown section in the photo). With no ropes or pro. we didn't want to get over our heads.
Additionally, the ice above was already exposed to the sun.
We felt more comfortable about our decision when a shower of icefall came down that gully when we were halfway up our chosen route. Sure glad we weren't caught in the barrage!
As it turned out, there was only about 250' of climbing in the gully we ascended (once you enter the gully... not counting the fan, below). Short, but fun, nonetheless