Hey Bryan, check out some of the threads about the same subject for more info. A few here recently in fact. But "best" is kind of subjective (at best!%)) sometimes, so tell us what you want to achieve and what makes something the best for you.
Are you going to be four-wheeling this? If so, what kind of terrain?
How much capacity to you want/need? Running a second tank, or just this one?
Will your engine be fuel-injected or carbureted?
Looking for a hot-roddy kind of a look, or just general truck accessory with added capacity?
Each of these things can contribute greatly to your decision.
Paul