In reply to bristol:
I have a pair of Leica 8 x 42, which are superb, but too heavy to carry around with all your gear.
In the compact 8 x 20 I have tested side by side (but not bought)
Svaroski - if money is no problem these are the best. If you can't afford them, don't ever look through a pair, as nothing else is quite as good.
Leica, Zeiss - expensive and very good, but IMHO not quite as good as the Svaroski.
RSPB - think these are about £200. Not quite up to the standard of the other three, but still very good indeed.