I'm a new biker - female, 5'8", 115 lbs, 32" inseem. I am looking for a bike that is affordbale (under 1500) that i can use for club rides. I am looking for something that will work for my first triathelon, as well. I'm 31 years old ... any advice is really appreciated. I have been searching web sites for fit recommendations ... i may be a 54 cm bike but i really don't know. Can anyone help?