Right now you may think you won't weld much - but there's a good chance when you find out what you can do and how much fun it is, that might change.
Whether it does or not, consider BUYING the biggest tank they will let you in your area (here in Oregon, my LWS will sell whatever size you want - other areas limit you.) My smallest (backup) tank is 120 cf, the rest are 250's or (acetylene) 330.
Either way, leasing SUCKS. Even more if you REALLY don't weld much, since you're paying rent on the tank whether you're emptying it once a week or once every 5 YEARS
If you OWN the tank, the only cost after initial purchase is when you FILL it. Then you just swap for another (full) tank.
If I had leased my industrial size Oxy and Acetylene tanks, (bought in 1979 for $350/pr) I would have spent over $2000 on leasing, PLUS refill costs. Bet you could find something else to spend $1700 on that's more fun than watching tanks sit around
Just something to consider... Steve