Best SYO-301 Study guide

ShWiVeL

I know most would recommend Gibson's book for SYO-201 but what about the best 301 book? I won't have much time to study this year and don't plan to take the exam until next year (301), but would like to read a chapter every now and then just to get some studying done in the mean time. What would you recommend? So far it seems the only books out there are those by Dulaney, Stewart, and Exam Cram.
Thanks