Steve,
I guess for me it all depends on your WC schedule and regiment? To me its a simple bio-load question. Do you want to do little WC or weekly, or more...
You can never go wrong with Rummies and or Cardinals. I have reaally wanted to try some hatchets myself.
Maybe a small group of hatchets for the top of the tank, some tetra's for the middle and up that corry collection a bit, plus they will help in-between the plants with left over food!
I'd love to see pics...