Thanks, Markku, for your wealth of speakers info.
I went round stores and they didn't even suggest bluetooth speakers, only the dock-in ones.
As you're more advanced in this experience of speakers, do you have a favourite?
What's your budget in $, € or £? And I don't remember whether you've told somewhere, but where do you live? Prices are different in the US than e.g. in some European countries.
After knowing how much moolah you want to invest in the speaker I can better suggest something