One successfull build I've seen is go into Wild Mage and take Practiced Spellcaster so you never have a penalty to your caster level.
One build concept I've toyed with is giving the warmage a decent wisdom (at least 12, maybe 14 - enough so that a Periapt +4 will let you cast Wall of Force), worship Boccob, and take the Arcane Disciple feat for the Force Domain, which allows you to qualify for Argent Savant (from Complete Arcane) at 10th level - Warmage Edge on top of Force Spell specialization is pretty nice, and Argent Savant is a 5 level prestige class so you max it out before you retire.
Only problem is that as a warmage you are already trying to pump Charisma and Int, and this throws another stat into the mix.
I currently run a Sorcerer 10/Argent Savant4, and it's a pretty nice class. I think it would work well with the Warmage.
One build concept I've toyed with is giving the warmage a decent wisdom (at least 12, maybe 14 - enough so that a Periapt +4 will let you cast Wall of Force), worship Boccob, and take the Arcane Disciple feat for the Force Domain, which allows you to qualify for Argent Savant (from Complete Arcane) at 10th level - Warmage Edge on top of Force Spell specialization is pretty nice, and Argent Savant is a 5 level prestige class so you max it out before you retire.
Only problem is that as a warmage you are already trying to pump Charisma and Int, and this throws another stat into the mix.
I currently run a Sorcerer 10/Argent Savant4, and it's a pretty nice class. I think it would work well with the Warmage.