Hey rcm005, you're asking very good questions, but in order to answer you, we'll need to have more details:
- What is your current job?
- What's your favorite thing about your current job? Your least favorite thing?
- What kind of career interests you the most? (Programming? Networking? System admin? Management? Sales?)
- What's your motivation to keep studying? (If you want better jobs, you probably go towards Engineering/MBA. If you want better knowledge, you probably go towards PhD)
If you want to study in Europe, you should read up about ECTS (
first link off google) and see where your current university stand in terms of european credit. Then the rest is just a matter of getting accepted in a school.
Ultimately, you should really think about what's your motivation to keep studying. For most people, you can get more benefit from working than from adding more diplomas.