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My favorite are nassarious snails and nerite snails, the gold and spotted shells add new color to the tank ( if you look closely) and the nerites can get into pretty much everywhere.
Just remember, you will need enough food to keep whatever you buy. Don't buy so many critters that you have to add food for them. The truth is, you really don't need a clean up crew at all. A couple of this and a couple of that, because you like to look at them, is what I would recommend.
What do you like? I would get a half dozen snails. Astreas probably....just 2 or 3 nassarius (these are carnivores and will eat uneaten food and fish poop only)...maybe a pair of skunk cleaner shrimp. That should be plenty.