Hi everybody i'm a newcomer to this website!To start the ball rolling,my question is...... i'm a a Canon person who does quite a bit of wildlife photograhy.However i only have a 75-300mm zoom lens,which is quite capable for a lot of shots,but lacks the pulling power.So i've decided i need something more powerful! I'm torn between the 100-400mm zoom & the prime 400mm 5.6 Canon lenses.Which way do i go chaps?Your advice would be appreciated.