I'm definitely no expert, especially by the fact I started this post, but generally road bikes don't have tri-geometry, and being that you are just getting into it my recommendation is to get a road bike that fits you well. I went to bikesdirect.com and bought a Mercier Galaxy AL which is a good fast road bike, and then if you get into it in a few years you can buy a tri-specific bike. I even installed aero bars on mine I got on ebay for $70. Its not perfect, but they help alot and help you get used to it.