Do you want a canary that sings well? And active or a more sluggish one? How many are you going to keep? Do you plan to breed them? Are you looking for a fancy canary or is a plain one ok?
I hope you understand that keeping canaries is not as simple as it seems. Unless you have a decent-sized aviary (at least 2x1 metres in diameter and 2 metres high), you will have to give you canaries exercise everyday by letting them fly around a room. And if you're keeping a single canary (which I don't advice you to), you will have to give it a lot of attention everyday.