For me the 70-210 APO is the usual lens to use, it has the appature to go faster if needed (which is used every once in a while with Velvia), and it covers the zoom range I am looking for. When I need 300 in the daylight, I will dragout the 75-300 ED, which gives me 300mm, with the excellent Nikon ED glass, that works well during the daylight, but even when I have this lens, it spends alot of its time around 200mm.
For Click Happy, the 80-200 F2.8 D ED is the way to go, because its a 120-300mm for you. Get either the AF or AFS and you will be happy, because the AF speed isn't that bad. But if you want the AF speed, but don't want to spend $1500, consider the Sigma 70-200 F2.8 APO HSM.
At worst, you screw up and die.