(Just posted this at GitP, but I wanted to get you guys' opinions too.)
My GM runs a fairly strict Paizo-only PF game, at least provisionally. (He apparently adds in 3rd party content as bonuses.) After a disappointing run with a Kineticist, he gave me the go ahead to run a Warlock from Complete Arcane.
I want to try to collect all the vital components from 3.5e, including prestige classes and relevant feats, and put it together into a single PF-style class. I want to do the common reinterpretation and add different pacts (like 4e/5e) as bloodline-style class features, and generally fold the various prestige class features that are common in 3.5 into selectable class features/invocations, like turn Hellfire Warlock into an essence, and Dragonfire Adept into either a dragon pact, or an archetype, or both (I’m thinking a ‘dragon pact’, as well as a more full-featured DFA archetype.) Likewise, fold Hexblade in as an archetype ala 4e.
And, yes, I know there've been a few other such attempts, but none of them really hit me as capturing what I enjoyed of the 3.5 warlock. I'm NOT adding daily spell slots, for one thing. I want to keep to the at-will invocations. Feel free to suggest good adaptations and their best parts, but I want to do this myself to hit the flavor I like.
So, mechanically, it would be 90% 3.5e Warlock/DFA, with little touches of 4e/5e, structured to fit into a PF game. What are the vital components there?