Based on the Marvel Previews #6, January for March 2013, I'd say you need to pre-order the following books in order to keep up with Spider-Man.
Core Titles
Avenging Spider-Man #18
Marvel Universe Ultimate Spider-Man #12
Scarlet Spider #15
Superior Spider-Man #5
Superior Spider-Man #5, Bagley variant
Superior Spider-Man #6
Superior Spider-Man #6 AU
Ultimate Spider-Man #21
Guest Apps
Alpha: Big Time #2
Avengers #7
Spin-Offs
Venom #32
Venom: Devil's Pack TPB
Reprints
Iron Man 2020 TPB
Marvel Now! Omnibus HC