Suspension Upgrade ?

davleweua

Having only ever ridden motocross, which I've had to give up due to serious injuries I am new to mountain biking. I recently bought a new 08 Specialized fsr xc comp which I have found to be a good purchase, however the bike seems to lack travel on the suspension (Rock Shox Tora SL 302) and seems to bottom out on a lot of the small to medium jumps on my local trails. With this in mind I am hoping that some good person can give some advice on what type of shock I could upgrade to, that would be compatible with my bike without upsetting the geometry. Any suggestion would be most welcomed.