Based on the Marvel Previews #23, June for August 2014, I'd say you need to pre-order the following books in order to keep up with Spider-Man.
Core Titles
Amazing Spider-Man #1.4
Amazing Spider-Man #1.4, variant sketch cover Alex Ross
Amazing Spider-Man #5
Marvel Universe Ultimate Spider-Man #29
Miles Morales: The Ultimate Spider-Man #4
Spider-Man 2099 #2
Spider-Man 2099 #2, variant cover
Superior Foes Of Spider-Man #14
Superior Spider-Man #32
Superior Spider-Man #32, variant cover Skotti Young
Guest Apps
All-New Ultimates #6
All-New Ultimates #7
Marvel 75th Anniversary Magazine #1
Reprints
Ultimate Comics Spider-Man By Brian Michael Bendis Vol. 5 TPB