I know you've made your choice, but I'd love to know why you limited it to just these two.
To me, they are a little on the gamer "bling" side with the blue accents. Personally, since I sometimes like to take one with me on the go, I'd rather it not be so noticeable. That said, if these are really the two best out there, then bring on the neon! (I have a sharpie)
I agree with you that a cooler is wise. I have used an Antec (two blade version that Staples often has) for several years. Although the blades are smaller that the single larger ones on the two you listed, I feel more secure that if one burned out, the other could handle some of the duty until replaced.
If I did have to choose between the two you list, I'd go with that Cooler Master by the build of the base. The Enermax model is similar to the rack-like passive coolers that provide air circulation clearance at an incline. Those aren't as surefooted as ones with a level base, and could topple off a desk more easily. It was one of the reasons I went with my Antec.