Vennies are more common than they used to be and they dont tend to push that kind of price. You will get more expensive Nirvanas MOC.
To date we have never seen a MOC South African [had a couple of babies but they were HK releases on a Prima card and we have seen a backcard but no pony]. I would not imagine how much one of them would fetch when they turn up. Likewise Columbians; they will probably also be higher.
There are some Greeks, Italians, Spanish and Brazilian ponies who will all push higher as well. Not to mention some of the French oddities.