I would go for the SkyStar 2, it is the best piece of equipment I have ever seen in my entire miserable life.
I must clarify I have both, the nexus and the SkyStar 2. The advantage of the Nexus is that your CPU will be below the 2% of use while using the hardware mpeg decoder, but that is not a big deal if you have a good machine.
On the other hand, if you have an NVidia FX video card you can use the proper graph and codec to take advantage of the FX decoding capabilities
while using the SkyStar 2 (which is cheaper than the nexus), switching channels is a little faster with the SkyStar 2.
Good luck.
I