Cathleen,

I can't offer you much brand/model suggestion in that price range (I'm sure others can, though); however, just a couple of points:

Absolutely #1. Make sure it fits! Have a professional fit at one of the LBS in your area, because your position on a road bike will be quite different than on a comfort/hybrid bike. Depending on your proportions and height, you may need a WSD (womens-specific design) bike (as I do) to get a short enough top tube. Make sure you get a short enough top tube that you end up with at least a 9 cm (90mm) stem or you'll sacrifice some bike handling. You may also need narrower handlebars, short-reach brake levers, and shorter cranks than on a non-WSD bike. Some women do, some don't.

2. Steel can be light. I had an old steel hybrid that weighed a ton, but that was because it was big, had cheap, heavy components, and was a less expensive steel. There are steel alloys that are much lighter, like the ones Terry uses in their WSD bikes. Steel makes for a very comfy ride. Aluminum can be harsher but has its devotees. With a carbon-fiber fork, which you'll want no matter which frame material you end up with, you may find aluminum perfectly fine. I have two steel bikes and a carbon-fiber bike so just haven't ridden aluminum to have an opinion. I would certainly test ride one and see what you think, though. Try to ride it on some bumpy roads too as that is where you'll feel any harshness.

3. Test ride as many bikes as you can before making your decision. That can be hard if you're a smaller size, but do the best you can. You want to make the right decision and not be back for something else in a year (as I was).

Good luck, and let us know what you decide on. Exciting!

Emily