Originally posted by Diki:
You have forgotten the only difference anyone seems to care about here... 
PA500 22 lb.
PA2Xpro 40 lb. 
Oh, and no OS2 for PA500... no DNC (SA type voices), no Guitar mode, etc..So far it seems like the perfect travel keyboard. Oversize and overweight charges are exorbitant nowadays. I'm going to Australia on Sunday and if I take my T3 or Pa2x, I will be paying $750 at least (from NY).
The Pa500 seems to have 90% of the sounds, and 90% of the styles of its older brother ... so I'm thinking this might be a good investment, especially since I have the option to buy one second hand for $950.
Would still like to hear if anyone has anything to add.