I'm looking for advice to put a scope on an old Cooey 600. It was my father's, but I've never fired it. I'm looking at getting it ready, as I have some friends coming over in the next couple of months, and if the weather works out, I would like to take them out to try a new sport. I don't want to break the bank, but I would also like something that doesn't fall apart too easily. I don't know how much it will get used other than for visitors, but I would like it to be reasonablefor them, and possibly for me if I have fun with it. Any advice would be helpful. Brand names and models would be useful, since I have no idea what works best on a rimfire. 