Hi there! I'm a newbie biker too (started biking for a triathlon, but found out I actually like it). Purchased a new Trek FX 7.5 last year and was totally stoked about it... until I rode it in a triathlon. It's a sweet bike for sure-- the perfect hybrid, pretty fast, not too scary, sitting more upright type of bike, but it's not for going really *fast*. I took a spin on a friend's road bike and was totally surprised how smooth and fast it was!
All that said, I think the hybrid is the perfect starter bike! My bike is going to be my training bike, commuter bike, and fun take-a-ride-on-the-weekend-bike. I think going with a fx 7.3 or so is perfect-- you end up saving some cash (instead of buying a fx 7.5), while still getting a pretty sweet bike that will let you do whatever you want! And if you want to upgrade to something else in a couple years, you won't have spent a ton of moola on the first bike.
Happy bike shopping!
What would you attempt to do if you knew you could not fail?
--Anonymous