Goodness me. I had a Factor 2 long sleeve zip top in a rather spectacular purple sometime in the late eighties.... I had no idea they still existed. It was, at the time, a very good bit of kit but not sure how it would measure up against the competition now.
Humans aren't designed to pee lying down. It's a skill that needs some practice. This is difficult to explain to the wife, however….
One day I shall recount the story of the Great Culra Pee Tsunami of January 1995 but to be honest I still break into a sweat at the thought of it, it's all too horrible and vivid (and probably fulfils the criteria for post traumatic stress disorder).
Hourglass shaped packs I have used without exception have been difficult to pack - think of a cylinder with an annoying narrowing halfway down for no particular reason.Things about the same size as the bottom of the pack have to go in on their sides and then rotate into position assuming they are short enough to do so, leaving lttle gaps in front and behind. On a 30-40 litre pack this is usually the sleeping bag. Here I guess a primaloft top would be the likely contender…
The Cap d'Orto looks to be ideal for you - http://www.summitpost.org/capo-d-orto/152247 I did this many years ago and although very hot it was magnificent, with very easy scrambling. Great day out. HTH Ben