Nice little collection! If I were you I would also hang onto that 2289, they're great rifle/carbine/pistols. It's the only pumper I'm keeping... and I have 2... and I'm keeping both.
If your SA6 is leaking you should send it to cdnairgunner. He does magic with them and it seems in pretty good condition, you have the piercing bolt, the little "door" to cover the CO2, I think it would really be worth it.
Or just sell it... to me?