Again, TxDoc is offering good suggestions! While you don't need to go and invest in a new TT bike, you will need to make additioanl adjustments to your road bike (eventually) if you want to get into a more aerodynamic position. While the bars will certainly help (Profiles are good, and I prefer the stright version with a slight bend), your saddle position can be just as important. You will likely need to adjust height as well as fore/aft position (i.e., moving the saddle closer to the bars).

Helmets are entirely personal. I've had great luck with the Louis Garneau's, and Santa brought me a brand new spiffy one for Christmas that I can't wait to break in.

SheFly