Carlos...
I tend to generally purchase at Berry's especially if I am looking for some good advise on new lures etc. If I do know what I need I will go to Army&Navy (the one in the great "eastside" neighborhood :drunk

or 3Vets which is between 6th and 7th on the street which is one block east of Cambie. For me it is primarily because it is close to home and I can't stand driving out to Richmond.....Van/Richmond traffic makes me :wallbash: I know most of these places are a bit of a drive for you from Mission but if you are out this way they are all pretty good. I generally buy my crab/prawn traps at Army/Navy as they tend to be a bit cheaper. Steveson Marine is not bad, but the one in my area doesn't have a overly significant fishing section.
Recently there has been a new store that opened up on West Broadway in Vancouver right near Mountain Equipment Co-Op but I have yet to check it out. I'll make a point to as I am usually around there a couple times a week.
If you are out this way and looking to drop your boat in by the planetarium, the stores previously mentioned are all pretty much on the way there from Mission. If you are going to drive THAT far then going a few blocks out of the way to check them out shouldn't be too bad.
Generally I would say if you want good advice on gear and you are "newer" to the chuck.....Berry's would be a good trip to get started out.