I wouldn't suggest the most expensive one. I got it, and I only ended up using half the practice tests and none of the question bank problems. Each test takes 60 minutes, plus going over the answers, so gauge how much time you'll have to do Crack. I wasted my money getting the Royal Flush package. Looking back, I'd get something with 10 practice tests and no question bank. Doing 10 practice tests for a month up until your test will get you in peak condition.
Others may have different suggestions, though! Listen to everyone and make a decision based on your own study techniques.