It's more about a balance than anything else. Basically anything that's not a psychic-type or a normal-type is what you want right now. Though if you see one of those and it's something you really want, don't let me stop you from going after it.

You'll probably see a lot of bug and flying types around where you are. Go ahead and grab them if you want, but those are pretty common so you shouldn't have to feel like you're obligated or anything.