What would you suggest for my last fish?

I really can't help with the fish question, since I haven't started stocking my tank yet...

But for the clean-up crew, you really could use more. Think snails and maybe hermit crabs. In my 45 gallon we bought 10 nassarius snails, 14 cerith snails, 9 scarlet reef hermit crabs, 1 emerald crab, 1 peppermint shrimp and 1 Turbo snail! They are doing a great job keeping keeping my tank clean. With my LR I have at least 3 brittlestars, 1 medium-sized snail, and a huge hatching of baby snails.

I'm not sure of the numbers, but a decent way to measure how many snails and hermit crabs to get up to 1 snail or hermit per gallon. The Turbo snail equals 5 or more snails... mine's bigger than a golf ball! You may want to look at cleaning packages on-line there are some good deals. We got free shipping on ours... we joined up with another person and orderred enough not to have to pay shipping. We orderred from etropicals.com, but there are others. I hope this helps with the second part of the question!

Get something with personality to it. I've always enjoyed the Flamed Hawkfish, but preferences vary from person to person. I recommend you just take your time in finding the perfect fish that YOU will enjoy the most. Happy hunting!