We have all heard the ideas of a "strong' (Northern) Euro and a "weaker" (Southern/ Eastern) one.
But if we as the stronger side of Europe are going to have a Euro who should be in it ?
The Netherlands, Germany, Luxembourg, France, Denmark (if they would choose so to give up the Krone), Sweden (if they would choose so to give up the Kronor), Finland, Estonia (if they would choose so to give up the Kroon) and Austria.
Belgium seems to have an amazing amount of problems: both with debts and political issues. Britain (if they would even choose to give up the Pound) would be marred with socio-economic issues so maybe not worth it. Ireland certainly isn't ready and neither is Iceland.
If Norway would choose to join (eventhough it is like Iceland not a EU member) then they would make a fine and stable Euro-partner (and the same would go for Switzerland and maybe Liechtenstein).
It could be expanded with the Czech Republic and Slovenia when these countries are ready. What the rest does is their concern but we shouldn't bail them out. Period.