If its for you daughter I would say its probably more important to find a really well cared for X3 with lower miles than deciding between the LCI or pre-LCI.

pre-LCI, expansion tanks last 80 to 100k, oil filter housing gasket the same. water pumps the same or longer if you are lucky. my LCI's have 80k and 103k miles on them. both 6MT. rear window regulators like to go out too.