Joe T, I'm having a somewhat similar crisis of confidence at the moment in my D200.
I've always used Canon DSLRs through work but when it came to buying my own at the start of the year, I went with the reviews (and the bigger body that suits my big hands) and opted for the D200. I wasn't too phased by the fact the D300 came out about the same time, writing it off as getting a good deal on a superioir DSLR to the 30/40D. Plus, I was happy with the image quality that 10MP was giving me and the ease of use which the D200 has to be aplauded for. I also thought the ISO performance was okay too.
I love my D200, especially the feel and weight of the body, and the 18-70mm is a great lens considering it's a cheapo 'kit' lens. However, I bought a 70-200mm Sigma to go with it and for the life of me can't get a shot that's truly sharp. Back focus issues, as I found on the internet, are common with Sigma EX lenses so I took it into Jessops today to see what they thought and apart from some totally bemused looks when I mentioned the words 'backfocus' and 'Sigma' (they obviously don't do their homework). Shooting in the dim light of a tiny shop at ISO800 I stuck the lens on a D300 body and WOW! the quality at high ISO on the D300 is sooooooo much better than the D200.
I'm now thinking I rushed into things, although I didn't know the D300 prices would drop so quickly, and I'm also doubting the AF on the D200 - is it the lens or is it the D200?
With my chimney looking like the leaning tower of Pisa, windows around the house all losing their seals and the mortgage advisor now saying we can't borrow any money to renovate because it'll send us into negative equity, my camera woes seem a bit pettyin the scheme of things but still, I really wish the D200 could be just that little bit better.
Phew!! Went off on a tangent there!!...
