This might not be my list, or your list, but at least there's a reference here... PCWorld lists their Top 10 picks for handhelds. Their list is divided in Top 5 Advanced PDAs and Top 5 Basic PDAs:

Top 5 Advanced:

Palm Tugnsten T

Toshiba Pocket PC E335

Zayo USA A600 PPC

Sony clie PEG-NX70V

HP iPaq Pocket PC H5450

Top 5 Basic:

Palm zire

Handspring Visor Neo

Handera 330

Viewsonic Pocket PC V35

Casio Casiopeia BE-300 Pocket Organizer

Interesting their list does not include the Dell Axim or the HP iPAQ 1910.