ok these two pictures are the same. The left is before "photoshop repair" the right is after repair. It took roughly 20 minutes to fix these simple picture up and tommorrow I going to shoot some birds to see how hard it is to fix these up. And afterwards I will figure out what next.
At least I learned for the future dust cleaning is easy, but I wont do a wet cleaning again.

Just to dangerous...

http://www.nikonians.org/nikon/d80/nikon_d80_2.html

here we can see an overview off all camera systems. The D50 and D70s are not longer produced and only used available for around 400 - 600$. Which means it makes not really sens to fix my D50 because it is already close too 2 years old, has a third of its lifetime down (15k releases, rated arround 30 - 45k releases before shutter needs to be replaced) and the flash is dead.

So it will be most likley the D80 or if they announce the new model i will prob with this. The 1500$ for the D200 is just way to much for a hobby. And the main difference is shooting speed (would love to have 5fps) and all controls are accessible over buttons instead of a menu.

And 869$ vs 1500$ is quite a difference...

So I read a little bit more about the idea to replace to scratched sensor element with an infrared/new element and this element cost around 95$, but the problem is you need to take the camera apart in all little pieces which scares the hell out of me for obvious reason. The instructions are here

http://www.lifepixel.com/IR.htm

I could do it except the soldering part, where I'm missing the tools and the practice. So it seems like I have to pay the fee for it, if i go this way.