I hate to think I am getting a bug for longer lenses
That's why I had planned to keep my Pentax glass and just buy a K-5 replacement (probably 24MP) so I could still get some reach and quality from a crop format without spending up on Nikon tele's. Nikon Tele's are pretty expensive and heavy (300/4 isn't though). Also, the K-5 shutter is whisper quiet compared with the D800E.
Sorry for harping on about K-5's.. I'm still trying to get over my betrayal.. LOL
PS: It might pay for D800 owners to keep in mind that there are crop modes.
A 200/2.8 on a 1.5x crop factor is 'the same' as a 300mm F/4 lens on FF.