Hi again Anogar.

One thing that might fit your requirements better is if you at least change shirts when you get to the office. I find that when I cycle (hard) in the rain there's no way to avoid some moisture build-up inside my (goretex) jacket. Luckily, if I have a good baselayer on, the moisture is not on me; it's wicked away and it's on the inside of the jacket. (I have been using the long-sleeve synthetic long underwear that's available at REI and really like it).

Though it looks like you plan to commute in your business clothes, maybe just swapping out the shirt when you get to work might be a bit more comfortable.