Well, first of all I second the advice you just received: test ride as many bikes as you can, until you find the right fit.
However, before you completely eliminate used bikes from your search, remember that buying a used bike you will get far more bike for the same money.

If you plan to race at some point - a new bike in the 1-1.5k range is probably not the best you can buy. On the other hand, a used bike for around the same price could be a decent machine that takes you through your first 1-2 years of racing.

The downside of the used market is that you need to know what you need, where to look for it, and how to assess its conditions to determine the price that it is really worth.

So, test ride and find out what fits you: which kind of geometry, what size, what components you like better - and then go on from there. You may get lucky and find a good deal, once you know what to look for. Try to learn about bicycles while you do your shopping and test-riding: if you have friends that work in the field ask for advice and tips, everything will help you find the right bike.

Good luck!