I currently have a 12g nanocube and love it. However, some people have problems with JBJ products. The aquapod version of the nano cube might be a better choice. If you want a nano, you have to decide what you want to keep in it, as that will affect the size and what kind of filtration/lighting you decide to go with. Also, budget is a big concern. Do you want a tank where you choose your own lighting or one with lighting built in? Or you could spend more money on a more expensive / sleek looking tank and do the lighting / filtration yourself.
ADA tanks trimless and very sleek You could go with an eclipse 6 and modify the lighting. You could also go with a DecoKit 3, which i think i might get.
Desktop & Starter Aquarium Kits: 2- and 3-gallon Deco Kit Aquariums < Thats the url. If you go with one of thoes, turn the hang on back filters and turrn it into a
fuge, or buy an aquaclear hang on back, they make excelent nano
fuges.
