The other thing to do is research components (shifters, derailleurs, brakes,etc). I made a spreadsheet with different manufacturers products listed good-better-best. That way when I looked at a bikes I could compare the quality of the components. I was surprised to find that the most expensive entry level bikes didn't always have the better componenets when compared to less expensive ones. You need to also research whether you want a triple or a compact double and think about what your primary riding style is going to be for now(fooling around a bikepath, fitness, distance, racing). Ultimately you will want to get the one that feels the best. To start narrowing things down...are you short-waisted with long legs or long-waisted with short legs?