I'd say go for the Axim x50v. I own a HP iPAQ 2215, which is similar to the h5550/h5555 that you have listed. They are good PDA's but the technology is slowly starting to lag. Mine (and I believe the h5555) has a 400MHz Xscale with a 200MHz FSB, and I can do just about anything on it (I use Pocket Hack Master 2004 to "properly" scale the Xscale Proc. I have "safely" overclocked it to 572MHz with a 148MHz memory frequency and ~250MHz FSB. I could go higher, but I don't want to ruin my PDA and I don't have any real use for the extra power.). The iPAQ's you listed run Windows Mobile 2003, while the Axim uses Windows Mobile 2003 Second Edition and will probably be upgradable [sic?] to Windows Mobile 2005 (aka- Magneto). Also, if you want to use your PDA for "graphics intensive" games, I would recommend the Axim for the fact that it has 16MB dedicated graphics memory (if I remember correctly). I have been looking at upgrading my PDA, and have been looking at the Axim x50v quite seriously. Also, the Axim has a "True" (notice the quotes.

) VGA display while the iPAQ's (at least the h5550's. The hx4705 has a VGA display as well) use QVGA. Of course, as usual it's up to want you to use your PDA for and how long you plan to keep it. I can't comment on any of the others, because I haven't used those. Hope this helps.