Should I play the najdorf?

You can try to learn the themes of the e5 Najdorf (6. Be2 e5, 6. f4 e5, 6. Be3 e5, 6. g3 e5, even 6. h3 e5), that won't be time wasted anyway (e6 Najdorf is way too hard even at +2000). But you will also have to learn a lot of concrete lines after 6. Bc4 and 6. Bg5 just to survive (and there are so many that when you eventually get them you have forgotten already), that's the main problem.