So many cories and not enough space!

I think I've narrowed it down to sterbai, albino, agassizi and skunks (as I'm staring at skunks right now and they're just so dang cute!)! Maybe I should get one of each?

I only have 2 cories at the moment and I have a 30 gallon...so maybe 3 more total. Or do you guys think I can fit more in? The venezuelans are interesting also...
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Alive without breath,
As cold as death;
Never thirsty, ever drinking,
All in mail never clinking.
~ J.R.R. Tolkien ~