Bear canisters are hard to get into; don't assume they mask the food odors. Don't put them in trees; if the canister drops it can crack open. Put it in a low spot where it can't easily be rolled away. Do put tooth paste at least into the canister; really anything with a scent.

That said, in your case I wouldn't buy a canister unless I was outdoors a lot and didn't care about the added weight. If you're car camping, just keep the food in the car at night.
If you're backpacking much, consider an ursack (google it) combined with an odor proof liner.
Brian Lewis