Everybody has an idea of what they want to spend, but there are some important considerations here. You must get the features you need on a bike, any bike, or else you won't ride it. Maybe a couple of times, and then in the garage it goes forever. Keep in mind that if you buy at the low end of these ranges, your bike may just barely meet your requirements, and at the upper end will have all the bells and whistles you could imagine. Ask yourself where you are heading with your bike.
Road bikes tend be lightweight and full of speed.
Every road bike we carry has STI, which is Shimano's integrated brake lever and shifter. This allows the rider to shift and brake from a variety of conditions while keeping full grip on the handlebars. This allows you 24 to 27 speeds, giving you a low gear for big hills when you are low on energy. If you are racing, or thinking about it, get a light, efficient bike, with a double chainring up front and closer spaced gears. This allows you to choose the perfect gear for going fast, be it training or racing.