I've always liked Tetramin flake food and sinking granules. Their freeze-dried bloodworms are nice as well (got them free), all whole worms and not a lot of disintegrated mess like some other brands - the fish really go crazy for them.
I use Hikari brand as well for the bio-gold betta pellets, algae wafers, freeze-dried daphnia, and frozen bloodworms.
I also have Aquarian shrimp pellets and all the fish go wild for them. I like them a lot because they don't dissolve like some other sinking pellets, but instead break off into chunks that are eaten and not left to pollute the tank water.