For i7, the popular choices at the moment are:
Heatkiller 3.0 (either CU or LT - copper vs. delrin - LC has lower performance)
Apogee GTZ/XT (previous is cheaper, pretty good bang for buck; XT has almost best performance iirc)
EK Supreme LT or HF (same as GTZ/XT)
Enzotech Sapphire.
You should be able to sell the V1 and step up to one of these. With the right radiator, these will keep them nice and cool as they fold away.