I took Kino, purely for the PVP aspects. but teleport and swap come in really handy finding stuff around maps too general utility and getting past walls and stuff but what sold me is TK, which is pretty much a 20second ish lockdown.
These three skills synergize well with the warlock static ground skills too.
Your probably better off with linker though in all honesty.
EDIT: Guess i should explain my reasoning, well when you tk someone and you throw them in the opposite direction to where they are they get thrown next to you on the opposite side so the way i theory craft it, is you place pillar of agony grab them hold them in it while they take massive damae then after the knockback effect put sleep on them and finish them off with quickcast and spirits while your summon goes ham.