If you are just going to get a single canister, go with a Rena Filstar xp3 or an Eheim 2217.
A better route to go would be to get a pair of filters, whether it be 2 canisters or a canister and and hang on back (HOB). Using 2 filters will give you backup if one were to fail, as well as providing a high turnover rate (this is how many times the total volume of the tank goes through the filters per hour. Depending on your stocking, you should try to get a turnover rate between 5 and 10 times per hour (i.e. for a 55gal: 275 to 55 gph)
For the 2 filter option you could go with a pair of Rena XP2s or eheim 2215s, or pair one of them with an Aquaclear 70 or 110 hang on back.
If you plan to upgrade tanks in the future, you could always buy larger filters now to save money in the long run.