Richard

Any.

Most of them should be on dwarfing root-stock so that they don't break the pots apart. Consider though that Mandarins (aka Tangerines), Limes, and Kumquats are by nature smaller stature plants so I grow them on standard root-stock even in large pots.

Here's what I consider the top picks in Citrus:
Blood Orange, Moro
Blood Orange, Sanguineli
Calamondin
Citron, Fingered
Citron, Seville
Grapefruit, Oroblanco
Grapefruit, Rio Red
Kumquat, Nagami
Lemon, Eureka
Lemon, Pink Lemonade
Lemon, Pomona Sweet (acidless)
Lime, Bearss (aka Tahitian Lime)
Lime, Kaffir
Lime, Mexican Thornless (aka Thornkess Key Lime)
Lime, Sweet (acidless)
Mandarin, Gold Nugget
Mandarin, Tango
Navel Orange, Cara Cara
Navel Orange, Washington
Valencia Orange, MidKnight

Don't overlook the Sweet Lime. It's awesome as a flavoring in sauces and pastries.

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