I don't really avoid any publisher since I know even a crappy company can get the rights to publish a good game. Granted, some publishers muck up the localizations of games, but if I want to play said game, it's not like I have many options. It's either put up with a shoddy localization or import.
In terms of developers, I tend to avoid Western developers in general. They just don't often make the kinds of games that appeal to me. I grew up with NES, so I like platformers, Japanese-style RPGs, Zelda-style adventure games, shmups, arcade-style racing, etc. Western developers seem more interested in making FPSs, sandbox games, realistic racing, realistic sports, and so on. I'm always happy to give a Western game a try and have discovered plenty of gems, but in the end my gaming is still probably around 90-95% Japanese.