Have a look around the web on Nano cube set ups. I've looked at them myself for the simple fact that they are complete set-ups all included! I have a 10g that I a m using as a QT and holding tank but I don't have anything in it that requires lighting that most nanos do. If you use the 10 and plan on putting corals in it like our 90 then you already know you will need lighting at the very least. I use my 72g to filter the 2 nano tanks I have as I do PWCs every other day and sometimes every day! Just a little food for thought.
HTH....Good luck!