Hang around long enough, and you'll see a ton of people either upgrading or downgrading the size of their tank. It's just impossible to really pinpoint exactly what size will work best for you with any certainty. For that reason, I'd get up and running as cheaply as possible with a system you can enjoy for a few months as you get your legs under you. From there, you'll then have the foundation to decide if you've got the perfect size for you or if you want to change sizes.
