In reply to thinkpurple:
I have a Hispar 500 which has a Drishell outer and a MX inner, both work well. I particularly like the water resistance as i'm tall and often rub the bottom of the tent with my sleeping bag in the night.
What are you using it for?
Which fabric is best is subjective, if you need something more durable and totally windproof and quite water resistant Drishell is good if you need something very light MX is good. For a balance of durability, light damp and down resistance Ultrashell is probably the best.
The mummy hood is a bit more form fitting so is a bit warmer, it depends if you value lightness over warmth like for hill running or if your are spending a week in a freezing alpine hut maybe its worth it.
If you can avoid the custom stuff, PHD's standard stuff is still pretty customisable and usually a decent bit cheaper and they still have a varied selection.
Post edited at 20:37