Epic better than windstopper better than goretex better than DWR pertex.
Have yet to try eVent.

My fav is a Mountain Designs jacket made of (siliconised nylon fibres) Epic by Nextec cloth with pit zips. It would be even better with a back vent. The material is water resistant and pretty windproof. Good breathability, between pertex and windstopper. The Epic jacket with pit zips is the most comfortable for me, cycling in cool rain (5-15 dec C).

My impression is that you will get a little wet no matter what you wear if it is (a) raining hard and (b) you are cycling reasonably hard.

Forget the business suit unless you want to buy a new one each week. The only way to keep street clothes dry would be to pedal so slow you don't sweat; in which case goretex would be fine.