Anything east of Germany and Austria and northeast of Greece. I know many of these Ex-Eastern-Block countries joined the European Union but let's face reality here for a second: they have a rocky road in front of them and it will take them 25-35 years before these economies catch up with the western EU average. Many of these smaller countries (Bulgaria, Romania, Hungary etc.) unlike Russia have zero natural resources or any other hard or soft assets (yet) that give them an edge in international competition.
You prefer life with your feet inside your comfort zone. Good on you ... at least you know who you are and what you want.
interesting - especially when it seems you are living there. My experience is quite different - for instance in Prague most things are of the same quality as anywhere else (some are better). All services are timely, internet is fast enough (8Mb), women are gorgeous, city is beautiful, standard of living is on par with Portugal which is not high but not a poverty line, international connection (flights etc) is Ok and... beer is the best . They do NOT have zero natural resources. They do have cheap and well educated labor and perfect infrastructure (that varies through the region you defined though). Of course it helps when you have money - but that applies everywhere.
I'd imagine this really depends on your age. I have some friends who wouldn't go back to Switz if their job depended on it. They thought it was seriously boring, both Zurich and Geneva. Perhaps if you have a family it different.
Im not certain how one can build a life by constantly moving about to different places. I dont see the purpose. There is one thing certain in life and that is death. You cant leave your mark on the world by rotating residences every few years. It may seem exciting when your young, but as you get older you realize that you have no ties to any specific community, any specific person and your impact upon the world has been zilch. I've met quite a few older people who have moved out of the country and I have realized one thing. They didnt move there to live, they moved there to die. I want to live and make an impact on the world not go someplace to die.
There is a lot of comfort in being part of and contributing to a village. Its one path in life that may or may not lead to an inability to see value and joy in other paths.