I use IAGirl's gelatin pt, and it's done well for me. Cheap, easy, and customizable. The recipe is now off-site on Pedaheh's blog, and the thread about it on Curltalk is here. After you pt, if your hair feels dry, be sure to moisturize afterward. Not very dry and a protein free rinse out conditioner may work fine, more dry and you may need a deep moisture treatment.
CG since 11/2011
2c /3a F /Mii, low porosity

Autumn Products /Routine:
Clarifying: Herbal Essences Tealightfully Clean, Suave Professional Deep Clean Peppermint
Low Poo: Renpure Luxurious Argan Oil
Co-washes: VO5 Kiwi Lime Squeeze or Strawberries & Cream
Tresemme Expert Selection Perfectly (un)Done, Cure Care, VO5 KLS
LI (if needed):
Tresemme Perfectly (un)Done, VO5 KLS, Cure Care
Stylers: FSG, L'Oreal Clean gel, Tresemme Flawless Curls Bouncy Curls, LALSG, HETT, AIF
PT: IAGirl's as needed