Welcome to the forum! It's fantastic - everyone here is so helpful.

I was in your situation about a year ago- now I'm on my 3-rd bike and I'm beyond hooked.

I agree with all the other commments about fit - it's important. I would definitely check out Giant's OCR3 for Women- They always get great marks from Bicycling Mag and others - and at 650.00 new, it's a really good price for the bike and components - comes with a Shimano triple (12-27 cassette good for climbing hills), women specific geometry, etc. They tend to be pretty comfy - the tires are standards at 700x26 - which are substantial for a road bike (that might be good for you if you every ride on dirt roads or are used to a rougher road - it also helps with beginning stability).

I also highly recommend Bicycling Mag's Book- New Cycling Handbook- the first chapter is about types of bikes/riding, has a very understandable chapter on fit and things you need to know about bikes and riding. I bought it when I first got in to cycling and it has been extremely helpful. Took some of the mystery out of shopping for a bike - and helped me deal with Bike Shops. Though, I have to say, my LBS guys are great- they really help me and didn't treat me like a second class citizen when I was brand new. I know you'll find a shop or a person who will help without the tude.

Let us know how you do- Good Luck- No joy like being out on the road...