It all depends on what you want to do with your Bronco. If you are just going for the look and not gonna wheel it much you can go with a lift with just blocks for the rear and radius arm drop brackets for the front. If you are going wheelin where you will be flexing the suspension a lot you'll probably want to go with Superlift, Rancho or some other lift that offers the extended radius arms. I'm not a fan of blocks because they ride rougher than the stock suspension and you take a chance of spitting on out on the trails. I have the Rough Country 4" lift, but I did a Sky Mfg shackle flip on the rear rather than the blocks and have been very happy. Rough Country is probably about the least expensive lift you'll find. Do a search on lift kits on here and you will find all kinds of information about the different types of lifts.
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Roger