http://www.liveaquaria.com/product/a...t=1&page_num=1
Here's a link with a few suggestions. Its all presonal preferance though, just make sure not to overstock. Chromis's or some small clowns would be my first suggestions.
As for auto top off you can go as cheap as about $40 to build one yourself and have it work or as much as $250. I recommend getting one that has multiple redundent safetys to keep your floor dry though. Tunze would be the most commonly recommended one, but its about $200. DIY kits will work and may never fail on you, but be prepared if they do.