In reply to ebdon:
Are you tall and slim or more average sized?
I have a haglofs rando barrier which fits me really well in M (I'm 6' and 70kg). It has synthetic insulation on the front upper arms and hood, leaving the back and underarms with fleece for breathability. I've also heard good things about Marmot Varient and Alpinist.
Montane do the Alpha guide, patagonia do the nano puff hybrid and if you want a synthetic jacket with breathable underarm panels check out the Arc'teryx Atom LT, Outdoor research cathode, Rab Strata and Black Diamond access hybrid hoody.