Tunney - I'd just go for a road bike.
Tell them you want it to be set up for Tri bars too, as that's important, but then you can use it for Time Trials, Road Races, normal training etc etc. Lotsa Triathletes like the Giant TCR bikes - and they aren't tri specific.
I theeenk Tri bikes have different seat tube angles to theoretically save your legs for the run.