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Lot of questions - will try for some quick answers on a few of them:
Benefits of upgrading to X50V or X51V = the V mainly means a better screen capable of higher resolution - also possibly a faster processor (can't recall what the X50 has)
Benefit of Upgrade to a 51V specifically = it runs Windows Mobile 5, MS' latest / greatest mobile OS - which is (in my view) a significant upgrade to WM2003.
Reading .pdf files = I have not kept up with latest versions of the Adobe Reader for mobile, but there at least a couple of worthy (non-free) alternatives - Clearvue PDF and Repligo
256mb SD cards = yes, should be useable on the X50. Benefit of using them - additional storage space for progras, data, music, pics etc. - although with just the one slot, you may want to weigh up (now pretty low) costs of bigger cards when you get to storing bigger quantities of data / apps, vs. carrying round mutliple 256mb cards.
Hope that's of some help ...
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