I always come back to Iwata - I have 2.
I also like the Adidas competition weight gi.
The next one I'm planning to get is from http://www.fushida.ca/judo-gis-uniforms.php
I saw a friend wearing. It's a strong heavy gi from Canada (and I don't get anything for recommending them!).
And the one I'd like to get after that is one of Janet Rosen's hemp ones!