Blacksad
Explorer
Monster of Faerun & Rokugan would be nice addition
The first because you can't really go wrong with a book of monster in full color.
The second if you liked the setting in OA.
But it would have been easier if you told us what kind of character you expected to play or which kind of campaign you are used to DM, something more precise than "not modern"
Naval: Sea of Blood (I use it for my etherfarer campaign where ships sail the ethereal plane).
Evil: Evil by AEG (this one is usefull if you have never DMed an evil campaign, I don't know how usefull it would be for an experienced DM in this field).
Swashbuckling: swashbuckling adventures by AEG (this one is also interesting as a player, it has 90 prestige class, mainly for fighting style, and several interesting classes: alchemist for exemple, and some rules on bombs, mass combat, and naval combat).
Science-Fantasy: Dragonstar by FFG
Blessed by the gods with big wings or some mystic power: four color to fantasy by Natural 20 press (it would allow to have angel or Demon, with unique power, great for a medieval INS/MV game in d20).
The first because you can't really go wrong with a book of monster in full color.
The second if you liked the setting in OA.
But it would have been easier if you told us what kind of character you expected to play or which kind of campaign you are used to DM, something more precise than "not modern"

Naval: Sea of Blood (I use it for my etherfarer campaign where ships sail the ethereal plane).
Evil: Evil by AEG (this one is usefull if you have never DMed an evil campaign, I don't know how usefull it would be for an experienced DM in this field).
Swashbuckling: swashbuckling adventures by AEG (this one is also interesting as a player, it has 90 prestige class, mainly for fighting style, and several interesting classes: alchemist for exemple, and some rules on bombs, mass combat, and naval combat).
Science-Fantasy: Dragonstar by FFG
Blessed by the gods with big wings or some mystic power: four color to fantasy by Natural 20 press (it would allow to have angel or Demon, with unique power, great for a medieval INS/MV game in d20).