@unhurt - you might wish to consider Paramo's jackets with the "Analogy Light" fabric (Velez, Quito, Mirada). Paramo jackets are usually considered very cosy, hence the suggestion for the Light version. Plenty of vents, breathable (I mean you can actually breath through the fabric!) and yet somehow waterproof. Not the "sit in a puddle and remain dry" waterproof of Goretex, but remain dry all day when outdoors waterproof.
I think the difference (which some attribute to magic!) is because Goretex (and similar) have effectively a plastic bag which lets vapour out (slowly) but prevents liquids getting in. Paramo's fabric seems instead to be designed to "pump" liquid out, hence keeping the wearer dry and comfortable.
Downsides include cost, more frequent washing (but no need to reproof Paramo do recommend particular wash and proofing additives) and probably style!
Robert