Well done getting a down bag and I wouldn't worry too much about hydrophobic down or otherwise: untreated down floats on water and requires a serious soaking to make much difference to its warmth.
Unless you cannot afford a down bag or are on a multiday very serious expedition in appalling conditions where drying your bag is impossible, there is no good reason to buy a synthetic bag. Unless your tent's rubbish I suppose.
I have realised that owning 3 top spec waterproof jackets is unjustifiable and this one I never use. It's been worn five times ever and as a result it is in excellent condition - still has the factory DWR and everything. Arc'teryx no longer make this model but the closest of their current line up is the Alpha FL.
My version is the first year it was made so it has two handwarmer pockets at mid-height but uses Gore Tex Active so the jacket still comes in at 320 g. Can send photos if you are interested. Mine is the version reviewed here: http://www.backpacker.com/gear/apparel/jackets/gear-review-arc-teryx-beta-fl-hardshell-jacket/