You can surf the web for initial research, but please don't buy your bike on the web. A bike could look great on paper, but when you start turning the wheels, it won't be right for you.
The ONLY way you will know if a WSD or a "regular" bike is right for you is to test ride!!! Make an appointment with a shop that carries a few of the bikes that make your short list, and have them set up for you to demo (and be open to their suggestions of bikes that you didn't even consider). Don't just ride around the parking lot. Take it out for a ride. Try hills. Flats. Fast. Slow. Turns. How does it feel? Think you won't be able to tell the difference between one bike and another?? You might surprise yourself.