The X30 and X50 lines are both considered obsolete, being replaced by the X51 line over a year ago. Then, if you want the best, you'd look at the X51v, their top-of-the-line model with a 624MHz processor, VGA display, multimedia accelerator, etc. However, the question is do you want to pay for the best?
I'm looking for a PDA which I would be able to listen to music on, read ebooks on, surf the net and be able to check my emails. I was looking at the Dell Axims (mainly the x30 and the x50) and they all look pretty good. I was wondering which one everyone else thinks is the best?