gazelle5333

I have been riding an old mountain(1990's) which would be the equivalent of a hybrid by today's standards on the streets around my town (20-30 miles per ride since that's all my legs can take on that bike). I'm looking to make the jump to a road bike but am interested in competing in tri/duathlons, as well as competing with my friends on the rode. I've been looking at the Specialized Tarmac/Roubaix/Allez Elite as well as the Trek 2.1. I loved the feel of the Tarmac as a road bike but am second guessing myself on purchasing a road bike to ride tri/duathlons with. Most people I've seen race tri/duals have TT specific bikes. Ive narrowed it down to these couple Q's.
1) Is it crazy to get a TT specific bike as my first road bike?
2) Should I just get clip on aero-bars and attach them to the conventional road bike?
3) Is there a model/line of bikes that can be converted between the two styles?

Any input would be greatly appreciated. Thank you.

PS. I also have a budget as I am in my second year of college. I'm looking for something at most 2000, which would be the 2009 tarmac elite.