lots of great bike makers - Trek, specialized, bianchi, cannondale, cervelo talk w/ your good local bike shop about a bike that fits you and your budget they should be able to hook u up

If you are on a budget there are lots of good bikes on ebay and craigslist if you know your size.  If you plan to stick with tri's you'll want to make sure you can get the best bike you can afford whether its new or used.  I was on a budget when I bought my first bike and after a year of racing was ready to upgrade and I'm very glad I did.