You've clearly got 'an eye for detail', Dave. 
Orca I had a bit of a mare around March/April time last year when my bike mileage started to mount (and I wasn't constantly stopping for cake etc). I tried the Sel Italia Gel one with a cutaway - will look up the name if you like (Diva I think) - but hated it. Then tried the Specialised Jet 143, recommended by Mouse.
What I thought was that perhaps some people got sore bits at the front and some people had probs 'in the middle' which is where having a cutaway came in useful. I think I'm one of the ones that has probs at the front and the Jet is great because, as ShuffleB says with her saddle, your sit bones seem to be the only bit in contact with saddle and nothing else is in contact. Problem solved. Took a bit of getting used to but it was so much better than before... It's got a cut away, too, so perhaps it would work if you were a middle area sufferer, too.
Oh, and I've got it set absolutely horizontal so it's not as if there's no pressure on the front because I've got it tipped down.
Thing is, we're all anatomically different so it's def not one size fits all. My LBS was very nice and let me try the Sel Italia knowing I might not buy it.