I suggest you to take your 3-4 competitor and see which type of link do they get from opensiteexplorer, starting from the juicy one.
After a while that you look at your competitor link profile, you will start to see pattern. Link acquisition pattern. So you will find that in your niche, one of the best strategy is for example to get review from blogger website. Or that you could get link from specific directory / website.
My suggestion is to calculate cost / benefit for each of those strategy, and then to start from the strategy that have the best ratio overall.
