Ooh, trust me you've got more than you need right there in front of you. A half diamond and short hook is all you need to open most locks... you also have 3 different rakes, a double sided pick and a nice assortment of wrenches. You'll find that tension wrenches are far more important when it comes to picking anyway, so if you're considering buying a new pick set you may as well just get a bunch of those instead.
Now, as for the other stuff in that set... there is one of those oversized hooks in there which personally I've never found a use for; they don't fit into any keyway I've ever come across (even the slimline ones) although if you're in the states I guess it might fit into a kwikset. Regardless, if you grind it down to a medium hook you'll get a lot more use out of it. You won't miss it seeing as there really is no need for a hook that size. You may get some use out of the half ball, but as for the ball rake you could mod that aswell since they're only really used for raking double sided wafer locks and there are far better tools for those - like you'll be picking many of them anyway. Maybe turn it into a kind of round tipped half diamond with a little groove for it to rest on pins easier or something, use your imagination.
