SuperPrep - It has 3 practice tests that are useful; I would recommend this book maybe two weeks before the test. Since the info is from LSAC and recent, the practice in this book will be most similar to the actual LSAT.
I've only heard rave reviews about PowerScore Bibles (especially the Games and Logic). I've also heard good things about Kaplan's 180.
I have a Barron's practice book and people have given it mixed reviews. I like it because first of all, the book is cheap and second, there are 6 practice tests. Although they are not "official LSAC" tests, the scores I get on Barron practice tests are pretty consistent with what I've been getting on the real LSAC practice tests, but be forewarned that the Games are more difficult in Barron's than on the actual test.
Take as many of the LSAC practice tests that you can! Don't bother taking the really old ones, I think like 1-18?...but anything after that is gold. I actually found all of the official practice tests online in another messageboard and downloaded them so I saved loads of money (I knoww...don't lecture me about "stealing"). Practice and reviewing your wrong answers is key.
Also remember that LR makes up HALF your score on the LSAT, so really perfect that as much as you can. Once you understand the games, you'll be fine in that section and it's fairly easy to get, but nailing LR is key because people are often inconsistent in that section.