Getting a student visa is easy and an excellent way to both get valid credentials and a feel for the local culture.
As to where you should go depends on what you're interested in, you'll almost certainly be able to make a home wherever, so pick something that seems interesting and go (you can always use your mandated vacation days to explore the rest of EU).
For language, in almost all the major cities people will be able to speak English, although typically you'll want to learn the local language sooner rather than later for social reasons.
If you know Spanish go Barcelona, beautiful city, vibrant in both culture and industry, and with values not too shockingly different to the US. For more info, either visit the Spanish consulate nearest you or look up their online presence.
If you want to keep to English, consider Ireland, they've also had a booming IT industry for all the giants needing a foot in the EU.
Mostly you can't go wrong anywhere in the EU. Biggest culture shock would probably be the Nordics or Slavic countries, but not necessarily in a bad way.
All of them have tons of info about student visas at each university, the degrees are standardised throughout the EU and most universities are good, and typically outstanding in a couple areas.
For more info you just contact their international coordinator, or their closest consulate.
Most countries also have dedicated Web pages that outline the process, steps, and how you move toward permanent residence and citizenship if you'd want that.
Moving is typically the hard part, but if you start as a student, you'll have a lot prepared for you (student accommodations, stipends, social activities, part-time job offers, recruitment fairs, incubators, etc.)