I have just beaten you too it.100-400L added to my D30 just two weeks ago
I purchased mine from Park Cameras and the price was the best I could find without going overseas. For me, that was not an option unless I was travelling.
Haven't really had the chance to give it a good workout. My latest stuff is with the lens and shots are noticeably sharper than my 75-300 IS USM
. But on saying that, all my 75-300 shots were sharp enough to produce fantastic prints. Just ask some of the guys I have sent prints to on this site.
Traffic is slow at ABZ
so I really need to get to LGW
.........watch this space
There will be many photographer here that can give you better advice than me on the lens. I'm a newbie.