I'm currently studying A2 economics, when i started the course last year i had absolutely no clue about the subject.
I happened to enjoy it very much and i've also applied to do it at uni!
It depends what you enjoy really, If you're more of a number person who likes to think logically - unit 1 will be for you. Unit 1 has alot of graphs and logic behind it.
However, if you enjoy writing then unit 2 (macro economics) will be enjoyable for you.
I enjoy the subject as it's current - as in, it's happening now, and you can relate to the real world.
Before economics i'd watch the 10 o'clock news and have no idea what they're talking about, now - i can fully understand.