1) 1.5v ram does not need any heat spreaders. They are mostly for marketing, or possibly for record level overclockers.
Buy ram with low or no heat spreaders.
2) Normally, you mount the fan on the cm hyper coolers in a push orientation, on the side near the ram and pushing the air through the cooler and out the back. But, you can also mount the fan in a pull orientation, drawing cooling air in through the cooler.
That way, the ram heat spreaders are not in the way.
I am gonna game a bit, but I am still getting Vengeance Ram, but it is the Low Profile version (still has a heat sink). But if you put the fan on the right side <-|HS|Fan|<RAM>, then the fan might hit the tall heat spreaders. It is just easier to go with low profile because I Want the fan pointing up because I will have 2 140MM exhaust fans there, so it works out well.