[dj_mocok]

Yes, D200 is a very good camera indeed (even for the price. It's around AUS$ 2,000 here), and with the build like that, it will last you a long time.

But if your budget doesn't allow, D80 will do you just fine. I actually prefer D80 in some parts, such as the lighter weight (although I prefer the size of D70), and the picture viewing zoom is much better than D200. With D200 if you wanna zoom to check focus accuracy, you have to hold the button and rotate the dial, then release, then use the arrow, whereas with D80, you just need to press the zoom button and use arrow to navigate. It may seem minor, but it's much more convenient.

D200's biggest advantage to me IMHO is the metering ability with AI lenses, but then if you don't own old lenses, this is not relevant.
Some people like the weather sealing, but I don't shoot in extreme condition, so weather sealing isn't really a big deal for me.
The size and feel of D200 in your hand is also a big yes factor for me. But then, my partner prefers D80 since it fits her hand better. So actually camera body is quite individual and depends on your shooting style/purpose.

But regardless of D200 or D80 (or even other brand within similar calibre), like Stevesurf implied, I think they are really good enough for most use already, don't have to worry so much about "getting outdated in a year or two".

I mean, they can take gorgeous pictures, even enlarged, fast enough, smart enough, solid enough, what else do you really need? Maybe more batteries, thats all, hehe...
Unless my camera broke early, I'd probably wait for an affordable full frame too if I decided to upgrade in the future, considering I honestly think I don't need any additional features at this stage (want, yes, but maybe not need).

About lenspen, so the smudge there was because of there was a little bit too much solution? I've been thinking it's because of it's not "wet" enough that's why it didn't clear that well. Perhaps I should try to find a really good grade microfibre cloth to wipe the lenspen residue after cleaning it. We don't have that particular microdear cloth here, and it's a bit too much hassle to have it ship to Australia.

To perplex: AI lenses will work fine with d70 and d50, but only in manual mode, so no auto metering available. I personally think it's quite okay, it will force you to learn more accurate exposure and the lens will be much much more solid compared to current generation AF lens. But if you shoot lots of moving objects, you'd better off with AF version I reckon.