Biking

I have a Pacific mountain bike. I have been riding 1:30 to 3 hours EVERYDAY (I time myself). It is tones of fun but even more because I bring my mp3 player with me. Front and rear shocks, out of curiosity why dont you guys like rear suspenstion, because of the weight?

I was looking at upgrading to a specialize but it does not seem like it would really be worth the upgrade. I saw some Cannondales and thought they were really cool.

Do any of you guys have experience with derailers? The bike shop guy said they were going bad, so what are some decent ones? I have shammono 7SIS in the rear and dont know what I have in the front.

Thanx,
Ali