Try updating to the current version of Forge. I run the minimap, optifine and NEI with no problems.
Edit: To be more specific, I use Forge v4.0.0.248, CodeChickenCore 0.6.0, and NotEnoughItems 1.4.0.0
I used the instructions provided for installing NEI. Both Code Chicken and NEI are in the coremods folder.
OptiFine_1.3.2_HD_U_B3 is copied to the minecraft.jar
ReiMinimap_v3.2_05 is in the mods folder.
That's my setup, Hope it helps.