Hey Sparkes!
To tell you the truth I would choose whatever citrus you would like the most. Obviously you'll be growing them in a container so I wouldn't worry about the zones unless you plan to keep them out all year long. Keep them out in the summer on the deck or in the backyard bring them in winter make sure everything is right for them in winter and you should have no problem!(worst case like mine is to have a spider mite war that never ENDS!!!) Again I'm in zone 3 and I have Eureka lemon, Meyer lemon, clementine mandarin, calamondin, and a type of Naval Orange. I had one naval orange fruit, and two meyer lemons and they were good!! The rest are either flowering or just finished flowering. Again make sure the plants get whatever they need(fertilizer, water when needed, pest control) and they'll be happy and so will you
links citrus source online(ordered other things but never ordered citrus from them. Only have lime and lemons anyway)
http://www.dominion-seed-house.com/en-CA/ProductList.aspx?CatID=586&PL=1