I would ask for the 220g cichlid display tank at my lfs or there 550g custom saltwater display tank! but I suppose that's a little too unrealistic.
I'd be happy with 1 or 2 more 10g tanks for a little more breeding room for my fish since I've got 2 breeding projects going on and only 2 tanks running. Need more space first though.
I'd really like permission to get the 72g instead of the 46g i'm planning on. not going to happen though.
other than that, i'd really like a kitty. but again, not going to happen as my mutt really likes jumping on kitties!