I've been trying to decide which phone I should get, and I've been leaning towards to Xperia Arc, but I'm a bit worried about the memory space. It has a bit less than the Galaxy. How many apps/pics etc. does the Xperia hold? And since there's a memory card for it as well, how much more memory would that give? And about how many additional apps etc would it be able to fit?

Thanks in advance!