I have also been thinking about a One X but those two things (integrated battery & no SD card) are putting me off.
I was using a One S today in Conrad & I love the Sense intergration & its very fast (even though its not quite a powerful as the One X).
I am favouring the Samsung Galaxy 3, as it has a changeable battery (but also no SD card) but on the Galaxy S1 I hate all of the Samsung apps they fill it up with...
Will wait until its available in Germany to have a play with.
Until then, Im sticking with Artemis as it does everything I need perfectly.
I use the Galaxy S1 then just for WhatsApp.