Based on the Marvel Previews #22, May for July 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 #1.3
Amazing Spider-Man #1.3, variant cover John Cassaday
Amazing Spider-Man #1.3, variant sketch cover Alex Ross
Amazing Spider-Man #4
Amazing Spider-Man #4, variant cover Humberto Ramos
Marvel Universe Ultimate Spider-Man #28
Miles Morales: The Ultimate Spider-Man #3
Miles Morales: The Ultimate Spider-Man #3, variant cover Sara Pichelli
Spider-Man 2099 #1
Spider-Man 2099 #1, variant cover J. Scott Campbell
Spider-Man 2099 #1, variant cover Rick Leonardi
Spider-Man 2099 #1, variant cover Skotti Young
Superior Foes Of Spider-Man #15
Guest Apps
All-New Ultimates #5
Spin-Offs
Deadpool Vs. Carnage TPB
Reprints
Marvel Masterworks: The Amazing Spider-Man Vol. 8 TPB
Marvel Masterworks: The Amazing Spider-Man Vol. 8 TPB, variant edition
Spider-Man: The Complete Alien Costume Saga Book 1 TPB
Superior Foes Of Spider-Man Vol. 2: The Crime Of The Century TPB