I love By Terry's mask, Tammy
Fender Epi Peel, M - 61 Power Glow Peel, Caudalie Glycolic Peel Mask, Kiehl's Radiance Mask, Fresh Vitamin Nectar Mask (currently using a lot lately for summer), and last but not least Dermalogica Multi-Vitamin Mask (another great one I have been using in the summer after a beach weekend!).
Every other night I'll add either a mask like Tata Harper's Clarifying Mask ($ 68), or an exfoliator like Tammy
Fender's
Epi - Peel ($ 80), to help detoxify or hydrate the skin, so it is at its peak performance to absorb all the serums and other products!