Hi Andy
I put up a post on our choice between a D200 and a D2Hs, which you might like to read first, here;
http://forums.dpreview.com/forums/read.asp?forum=1021&message=17843650
Apart from the speed, which we had expected, the image quality of the D2Hs has startled us. Super clean, very rich colour with a slight slant to the blue versus the D100's slight magenta tilt, and no detectable noise even at 1640. The "big pixel" effect is real. We also love the "no compromise" build and handling, the walk in and lie down viewfinder, the telepathic AF system and built-in, rather than bolt-on, battery. My wife said after just a few takes "this is the digital F5" (high praise from her)
But it does lack in very finest detail. Less than you might anticipate (to be frank the D200 doesn't actually render much more real detail than the D100), but a definite difference which may be an issue for some.
Eventually I suspect we will get a high megapixel body to compliment it (not replace it - neither the 2x or 200 come close for sports), but it would be more likely to be a D2x. In the meantime, the D100 is more than adequate when we need the pixels
We're going to try the 2Hs out on studio work shortly, I'll be interested to see how it does.
I really think it comes down to the type of work you do. The ladies do a high proportion of reportage and photojournalism, where speed is everything. Daughter is currently doing four European cities, 700 shot days, on her D100 and large files are a pain in the b*m.
The clincher was being offered a new ex-display D2Hs body with full warranty for 1500 quid. Strap still in sealed bag even. Deal done....
The chap I was corresponding with in that thread was undertaking the same comparison, and my advice to him was that, if we had to choose just one body, and on anything even remotely resembling a "budget", it would be the D200. It does most things very well, nothing badly (quality control apart - banding and colour fringing seem to be problems), and is very reasonably priced. We paid 1500 for our first D100 three years ago!
I'd recommend Grays of Westminster as knowledgable, helpful and the kind of folk you want to have bought from if you get a bad one. Keep in mind that almost every Nikon dSLR release has been bug riddled in the early days so swap-outability is an issue. Prices good too - usualy a few quid above the very cheapest, but worth it. 10 minutes walk from Victoria (the classic Nikon museum is worth the trip alone)
My day job is in the markets too - small world, isn't it!
I hope this helps
Regards
Ewen Cameron
Kent, UK