As you will be told any of the above cameras would be a good buy - there are'nt really any bad DSLRs in your list. So it does come down to which one feels best and has the right feature set up for you. The only minus about the Olympus models is the lack of affordable lenses - although Sigma are now producing some - so getting long telephotos for birding is'nt as easy. I am now using a Nikon D50 and previously used a D70 - for general use I would advise the D50 as this leaves more of the budget for lenses. For bird photography I can't say I've noticed any difference between the two cameras - except the D50 is slightly smaller and lighter. If you're talking budget 400mm then I can recommend the Sigma APO 135-400mm. If you've got a bit more to play with then it's probably worth exploring the Canon route as their L series lenses seem to be the favourite of many bird photographers!
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