the first and only thing which matters is personal preference, there is no 'correct tone' or 'correct saturation'
personally I tend to up the contrast and reduce the brightness and if resizing downwards tend to do a quick sharpen but that's about it - a lot of 'hardcore' will tweak the curves / levels and all sorts of things,. note I don't think this is d70s / d70 specific - it's just everyone does it (well a lot of ppl tweak images) and therefore ppl are used to seeing tweaked images (even though it is less faithful to the real world capture)
I would generally take a lot of this 'review' with a pinch of salt but the sRGB III and other settings are worth a play with
http://www.kenrockwell.com/nikon/d70.htm -
finally, the biggest difference I believe is to do with settings,. you can make a d50 and d70s image look nearly the same from camera (is my thoery - not tried it) the difference is the default settings on the d50 are different to the defaults on the d70(s) - a lot of reviews tend to talk abt jpegs but don't change any settings to see what else it can do
Sil
PS, I'd have to look to check - but on the d70 I tended to use sRGB and colour setting III - the rest I tended to leave where they were (auto sharpness / auto tone etc)