I think I'd ask myself if I were prone to buying too much... if so, then hold off. Also, you may want to get a few more miles under your backside to get to know what's important to you. However, if something lighter and faster will mean you can go on rides (especially with groups) that you can't keep up with on the hybrid -- and you'll go -- then you'll *get* those miles with a new bike.

I have usually had about 2 years between bike purchases; they each have a unique role. I started with a hybrid in... '91? ... in 2001 I decided to go with a lighter bike for longer, faster rides. I don't remember when I added the Vintage 1968 Racer to the fleet because that's an amazing cool bike that I grew up with and I found one cheap on ebay ($32, another 30 for shipping)... and then a little after that this grad student was selling his Dutch commuting bike 'cause he was graduating and going back to HOlland. (That I would have bought even if I'd bought a bike the week before, because it wasn't going to come along again!) Anotehr two years later and I got a folding bike for those traveling miles.

Any of my bikes cost less than a year's worth of auto insurance that I'm not paying.