Ultimate Magic- magus class
Core Rulebook- eldritch knight, bard
Inner Sea Magic- some very good spells
Advanced Race Guide- certain races have magus archetypes
Ultimate Combat- dervish dancer bard archetype
What constitutes a gish option for you?Do you want combat feats?
If you need to have the book to use what is in it, the Inner Sea Bestiary has my new 'go to' race for melee/caster types, the Android. Int and Dex mods, dark/low light vision, decent immunity/save bonus list and a decent bonus to a single roll per day. No benefit from moral bonuses, but as our groups hardly have bards in them it's a bit easier to lose.
I'd actually suggest going to d20pfsrd.com and skimming though the races/archtypes/spells/items there. They list where it comes from and if a couple things catch your eye you can narrow down what you might want to get from there.
Blood of Fiends, Blood of Angels for the alternate race options (stats & abilities) would probably be okay. Waiting on them to ship Blood of the Night so I can download it so cannot comment on that yet.
EDIT: Can't believe I forgot to mention Dreamscarred Press... they redid psionics for PFRPG. Psychic Warriors and Soulknife (gifted blade archtype) as well as their new Aegis class. Assuming you aren't limited to Core, pick up their stuff you won't be upset if you like 'gish' type characters.
I always forget .. what the heck's a gish? I know it's some term like CoDzilla and CdG and MAD and SAD and munchkin and CharOp but can never remember what it means (maybe because I have a tendency to spell things out).
Gish is a term for a Melee/Caster hybrid, originating from a race called Githyanki who called them such.
Basically, a Githyanki Eldritch Knight would be a Gish, but then every Melee/Caster got called a Gish and it stuck.