Efficient dispelling / countering

[BobVosh]

Cleric with the Inquisition Domain is a good place to start...

Also, reserves feats that boost CL for Abjuration spells - Magic Disruption, Mystic Backlash (you'll need to be about 9th level though)...

Are those in complete mage? Most of the reserve feats I know are there, but I don't remember those names at all. (AFB)

Abjurer 5/Master Specialist 10/Archmage 5

Take the Domain Granted Power ACF (CC) for Inquisition Domain's power, granting +4 to dispel checks. Master Specialist (CM) gives you a bonus to dispel checks equal to 1/2 class level (so +5 at Master Specialist 10), as well as +2 to CL for Abjuration spells. Archmage lets you increase your caster level by 1 each level.

This should work quite well. Thanks.

Dispelling Cord (MIC) gives +2 to dispel checks, while the feat Arcane Mastery (CArc) lets you take 10 on CL checks. Elven Spell Lore (PHB2) gives +2 to dispel checks using Dispel Magic/Greater Dispel Magic, while Arcane Thesis gives +2 caster level to a spell (Greater Dispel Magic) and makes it easier for you to Chain it, letting you hit everyone in the party in one casting.

Finally, the Reaving Dispel spell (CArc) is awesome if you want your PCs to get a taste of their own medicine. It lets you go up to +25 on the caster level for dispelling, and steals the buffs if you successfully dispel them. It's quite powerful if you're looking for high level solutions. You can chain this using a Greater Metamagic Rod of Chaining (CArc).

Isn't chain +5? Even with arcane thesis that makes it a 10th level spell. (Or is thesis -2, or chain +4? I don't use either much)

Alternatively, a psion may make a better dispeller, particularly at lower levels. This is mostly because of how Dispel Psionics works, since by 10th level, you can augment the power to 10 PP, letting you get 1d20 + 20 on your dispel check before outside bonuses. With Psionic/Magic transparency, you can dispel all of their buffs fairly easily at lower levels. The bonus doesn't increase if your ML goes up further though, so at higher levels, wizards make better dispellers.

I probably will use the top build for the main NPC, and throw in a bunch of level 10 or so psions as back up. Assuming the 1D20+20 counts for countering spells as well.