I'm going to disagree Toxic, and this is just my personal opinion. I could be wrong but here is my thinking on it, getting a used more expensive reel could end up being an issue. For those of us that know a bit more about how a reel should function it isn't as big a problem. For a newbie who doesn't know how a baitcaster should feel, or function a used reel could end up being a piece of equipment that hasn't been treated right and when he goes to use it he won't know if the reel is the issue, or if his casting is the issue. It would also be a good idea to service the used reel which would cost some more money.
I think with the current reels out there a reel in the 100+ dollar range be it Daiwa or Shimano or a BPS Pro Qualifier, you're going to get a good enough reel to learn on. If the Pro Qualifier is on sale for 50 as it has been sometimes in the past or even 75, it is also a fantastic reel to learn on. It has dual brakes and easy to access so if centrifugal brakes work best for your casting style you're covered, and if magnetic brakes work best for you then you are covered there as well. The combination of the two helps for learners.
What I really don't recommend is getting a model lesser than a Pro Qualifier, or getting a reel from some off brand thats under 100.
I can't speak for Abu as I have never owned one. I also can't really speak for Lews in the 100 price range. My only lews was in the 200 range.