I'm collecting the following based on educated guesses and past experience:

Crafting Materials:

-Fieldcraft Demimateria I/II/III
-Battlecraft Demimateria I/II/III
-Thavnairian Silk/Leather
-Antique Rug/Leather
-All other cheap "Glamour" mats.

Materia:

-Parry III/IV/V
-Crit III/IV/V
-Det III/IV/V
-SkS III/IV/V
-SpS III/IV/V
-STR III/IV/V
-VIT III/IV/V
-PIE III/IV/V
-Crafts III/IV/V
-Control III/IV/V
-CP III/IV/V
-Gather III/IV/V
-Percept III/IV/V
-GP III/IV/V
-Mhachi Matter/Demimatter (Not trading in until SB)

I'd also recommend stockpiling cheap 40-50/58-60 common mats such as Fleece, Snurble Tuft, Electrum Ore, Cobalt Ore, Silkworm Cocoon, Darksteel Ore, Spruce Log, Crawler Silk, Adamantite Ore, Gold Ore, Birch Log, etc.

Hope that helps getting you a good idea on what to go for!