Choosing one among the sea of personal speakers is pretty hard.There are a lot of factors for speakers to please you, the first one being your ears. Take note that your hearing will change after time also, so that go with the best sounding speaker to you. If you are demoing in a large electronics store, I must warn you that the noise around will disturb your demo. Also, don't just rely on specs or price, as a lot of manufacturers are cheating on these numbers.
Do you Europeans have something similar to Black Friday before Christmas?