Level requirement reduction gear is extremely expensive, be prepared to shelf out 10million gold per slot.
I only said a shield with level requirement reduction. Don't know why you would buy full gear if you're getting boosted anyways. Plus, lvl 60+ gear can't have +monster experience.
I use Cain's gear all the way to level 60 (that's 3 slots), and buy vita/socket/+monster exp for the rest (if it has all resist it's a bonus).
I don't buy any piece worth more than 50k - only the shield costed me like 500k, but I reuse it whenever I level new chars. Same with Leoric's.