Hi GreenLizard. Welcome to the forums. There's a thread in Open Topics called "Getting to know you." Come and introduce yourself there.
Hybrids generally will be slower than a road bike. This doesn't mean you won't be able to fast. Depending in your fit you could compensate for it.
What is your primary impetus for riding? Is it to get fit? Commuting? Just riding for fun?
If you're looking at riding with a group on the road getting dropped is never any fun. Being able to get the highest chance of staying with the group will increase your enjoyment of the ride.
If you're worried about bumpy sidewalks on a road bike, don't be. In addition you can jump curbs on one though you do need to do it right and make sure you're not going too fast.
Mel