i pronounce it like xantius said, whether it's correct or not, i don't know. It's my understanding that since Latin is a dead language, there's no right or wrong way of pronouncing it.
i also pronounce it like sit-uh-scene-uh
I don't know that Latin is a dead language, per se (pun intended), since I had to take plenty of it for the sciences -- and others require it for theology and the law. It saturates a whole number of disciplines, where its pronunciation is quite clear.
Aramaic -- now there's one plugged into the machines . . .
I've been pronouncing it sit-uh-scene-uh as well but didnt' know if that was correct.