If the gain is set low enough, the Seymour Duncan SFX-01 Pickup Booster is quite phenomenal.
The SFX-03 Twin Tube Classic would be more versatile, as it works amazingly with low and high gain- without colouring the tone, too much.
I've always liked using EQ pedals to push the needed frequencies forward. There are some great tube pedals from Electro-Harmonix that feature a 3-band EQ. If you need more tweakability, the MXR KFK-1 has been discontinued, but it was amazing. The M108 is the next best shot, for the money.