My fine, low-po hair Loves protein, you don't have to buy an expensive PT though. You could start with any RO with protein high up in the ingredient list, even some cheaply brands (VO5) have lines with protein. There's also a gelatin PT that's very popular though it didn't do much for me, my hair seems to respond better to regular doses of protein rather than once a week blasts.
2A / F / MD / LP / ?E / BSL --- CG since Dec. 2012

This is what I'm happiest with right now.
Co-wash: CJ DailyFix
Lo-poo: DermOrganic low-poo
RO: SS Caitlin's co
Leave-in: SheScentIt Okra Repair condish
PT: SS Caitlin's + SS PT
Stylers: Volumax Mega Gel, Max Green Styling Gel, DermOrganics Spray Gel
Techniques: Plopping & Pixie Diffusing.
glycerin, honey, oils & butters Protein!