Actually, I disagree with most of these posts. The people at good universities in the US know what schools are good abroad, and will judge you accordingly. I followed my advisor from Caltech to ETH/Eawag (Swiss federal water research institute), and all of the top U.S. researchers in the field (1) know where I am and (2) are jealous. This could be field-specific, but if ETH has any sort of reputation for computer science like it does for most sciences, you're so much better off there than Dallas or Minnesota...I have to admit that I haven't heard of Dallas University, and I always heard of Minnesota as being a party school.

As far as a job goes, my impression after 4 months in Switzerland is that there are way more jobs available in the U.S. than Europe, especially if you want to go into academia.

Good luck deciding where to go!