I just took step II this past Monday and here's my two bits. I likewise didn't want to spend a lot of time or money on books, questions, etc. I agree that First Aid for step II is subpar. I used Boards and Wards throughout M3 and found myself using that for my review. I also bought and used Crush the Boards. I opted not to use NMS because I wasn't looking for an a**whuppin'...mostly just wanted to do decently. Crush the Boards was good, but not as good as I had been led to believe by friends. It's a pretty easy read, and has some good pearls and high points in it. Boards and Wards was very complete and had more detail and meat to it than Crush. The actual test was about as advertised...not overly difficult, but not easy. Seems like every patient had Diabetes type I. I thought that was weird. I did the 3 tests that you can download from the USMLE web page and they were roughly like the real thing, if anything a little easier. If you want/need to ace it, I would probably do NMS and Q bank in addition to the review book of your choice. Good luck, I'm just glad to get it out of the way.
OF