I've only ever had 1 of what i would call a PDA which was a Dell Axim X50v which i still have somewhere but i've lost the strange connection to charge it, i could get another one but it just doesnt; strike me as useful anymore!!
I think i had one of the first smart phones which was a orange spv c500, a good while ago and for me was quiet a way ahead of it's time!
at the minute in work i deal with alot of PDA units that are quite old we've got HTC P6500 out in the field, Motorola ES400s and a coupel more Q Teks