I'm new to 21st century bicycling and looking for a hybrid that will be comfortable for 2-3 hours of exercise on roads and paths. I've done a little research around the web and on these forums, and I've decided on a Trek 7.2 '09. When I took one for a short test ride I didn't like how much of my weight was on the handlebars, the 7000 series was much better in this regard. The sales rep said they could put different handlebars on that would tilt towards me more. Would that really make it feel like the 7000, or does the frame geometry matter more? I have RSI in my hands so it's important that the bike doesn't force me to lean down on the bars.
The next problem was the frame size, I didn't notice much change between a 20" frame and a 22", except that the latter was harder to mount. Why do people say that sizing is so important? I'm 6' tall with about a 34" inseam, if that helps. The shop I visited was a Trek dealer so I haven't ridden any other brands.