Which EK FL to buy?

Hi guys, I'm sort of strapped for cash at the moment and can't really afford to buy more than 1 or 2 EK FL's (they're like $50 a piece). I know it's hard to say, but for those of you who have taken a couple or more, which do you think is the most fruitful/most representative of the AAMC FL and/or the real thing? I'm looking for something with heavy research since TPR seems to be way too focused on content.

thank you

Which EK FL to buy?