The Jepp textbooks are very high quality in terms of the book itself and the content, and they serve as a nice reference after you are done with the ticket. So that I highly recommend. But that $150 ppl flight kit is mostly a waste of money. The bag itself will not last through your private training without showing wear and tear. It's not made of cordura or anything very tough. The kit has a lot of additional stuff in there like maneuver guides and progress reports that your instructor may or may not want to use. If he or she does not specify the kit I wouldn't get it.

I know this is a little odd, but I have for years used a small motorcycle tank bag for all my flying. It's compact and efficient and extremely tough (cordura). I think it is made by RKA. You can't get extra radios and maps in there and it probably won't be large enough when doing CFI flying, or serious ifr flying, but I got 4 ratings with it and I never felt like I needed a bigger bag. The best thing about a small bag is you can keep it within reach. I am always thinking about what happens if I have one of those huge bags in the back seat and I am not able to get into it while airborne. I keep this thing either on the seat next to me or on the floor because it is small enough and easily managed.