I was thinking about getting a new bike...anyone who rides a bike have any advice about how much I should be spending, what type of bike I should look for (I plan to ride about 10-20 miles at a time, some small hills but mostly level, and about 95% of the area I'd be using is paved, the rest is gravel), what brands are the best value? I don't know if I should be limiting myself to bikes that are specifically for women or if it even matters?

I'd like to be able to walk into one of the local bike shops and at least have some idea of how much money I should be spending and what features I should be looking for.