Best older tiers recipes to start researching?

I have a ton of crafters so I'm looking for suggestions on best tiers to research aside from the current one. Level 70 has the group cures, 65 has Bolster, there's still some good ones at 55 and 58 iirc. Any suggestions beyond that?

Rescue (Level 25 fighter) tends to be popular - at least the Master has always sold nicely.

Go somewhere (like eq2u) and see which spells/arts (in the 40-60 range mostly) that haven't been upgraded. Chances are those won't be getting upgraded with the new expac either.