I think I am content -- at least for now. I have three (black city, rouge vif first and greige twiggy) and I get so much pleasure from those three colours and styles. At present, I'm not hanging out for any of the current colours.
If Balenciaga did produce a colour similar to magenta, apple green or eggplant again, I would consider a city in one of those colours. Also, my husband has been very good to me, not complaining that I have bought three b-bags since June. After my twiggy arrived, he said I should at least wait till Christmas if I want another. I think that's fair!