Newbie Bike

Ok, So I am a total Newbie on the search for the right bike to begin Tri Training with without breaking the bank. I am 27 yrs old, 5'8 ish, with a 34 inch inseam.

So far I'm thinking of starting with a:

-Carpe 60- 54 inch $284

-GNC Denali- 52" $199

-Diamondback Calico ST 29"- 54" $299