Definitely those listed above and also the Private Pilot Test Prep (ASA is the one I'm familiar with and is of very high quality). And if you pick up a FAR/AIM (ASA also produces one of those) you will definitely be ahead of the game when you actually start your training which will make it easier to focus on the practical side of things.

Also something you might consider Chief, while I was still enlisted I found a local pilot organization and got with a good CFI that let me sit in on ground lessons for free, sandbag in on lessons, and wash planes for some flight time to help prepare me for attending flight training full time. Also, you might check on your base and any bases near you and see if they have a flight training program. A lot of bases offer reduced rate civilian flight training to military personnel.