Big lenses with the D50

[smoranc]

I have a D50 for 3 years now. I've taken around 18k photos with it and I'm very happy. This is my first Nikon and so far no complaints. The thing is I want to go big with 2 new lenses (14-24 wide angle and a 70-200 AFS). I'm planning to get more in the Sports Photography.
-what do you think about using them with this camera?
-will the camera step up?
-also... is there a battery pack for the D50? ;D

Thanks and nice to be here.
Sergio MC
Guadalajara, México