What lens should I sell along with my D90?

So I want to sell some gear so that I could upgrade to a D800… What should I sell/keep and for how much?

1. I've got a D90 which I've got since 2008 and it is still in pretty good condition, everything works just fine though just a tiny bit scratched. Along with the battery grip (Perfect condition).
2. Nikkor 18-105mm kit lens. In a pretty beat condition on the outside, paint coming off a bit, but works perfectly.
3. Nikkor 70-300mm 4.5-5.6. Perfect condition.
4. Nikkor 20mm 2.8. Perfect condition.
5. Tamron 90mm 2.8. Perfect condition.

The 18-105 you won't be needing since it is a DX lens. It will work on a D800, but you won't be using the full frame

keep the rest

or

sell the 70-300 and get the 28-300 as a general use lens
http://www.kenrockwell.com/...300-vr.htm

"NEW: The 28-300mm VR does the same thing with about the same size and weight, and also covers the rest of the range down to 28mm. It costs more, but if you get a 28-300mm, it renders this 70-300mm completely unnecessary."

I agree that if you are really ditching APS-C, then you should sell the 18-105mm with the D90.
However, if you have the really good 70-300mm AF-S VR, I don't think that you should replace it with a 28-300mm. There will be compromises in image quality with that zoom range, and 36MP will be unforgiving of that. Maybe you will want to replace the 70-300mm with a 70-200mm.

Clearly you should sell any lens that only gives a DX-sized image, thus the 18-105mm. Check also the others, especially the 20mm, though a fixed 20mm is probably designed for a full-sized sensor.

If any of the lenses are quite old they might not give best results with that camera body, check when you have bought the body and sell the lenses later if necessary.