Your present choices from Sprint/Nextel are the…
• Palm Treo 650
• Sprint PPC 6700 [see Note 1]
Sadly, that's it.
Note 1: Requires the addition of the
Missing Sync for Windows Mobile 2.5—with support for Windows Mobile 5 devices—from Mark/Space, currently in alpha release for registered users of earlier versions of this application. iSync has no native support for Windows Mobile devices. See this link for more information:
http://www.markspace.com/wm5.html
Although Information Appliance Associates has promised a free upgrade of
PocketMac to support Windows Mobile 5, no such package is currently available. More information about
PocketMac is available here:
http://www.pocketmac.net/products/pmpro3/index.html
Although there is native support for Palm OS handheld organizers and smartphones in iSync, you will find that synchronization of a Palm device is a much more robust and reliable experience with the
Missing Sync for Palm OS from Mark/Space. More information about that application is available here:
http://www.markspace.com/missingsync_palmos.php
Maybe it's time to consider another carrier? ATT Cingular offers some compatible handsets, including iTunes-compatible units, T-Mobile allows you to use virtually any unlocked GSM mobile handset or smartphone on their network, and Verizon offers a number of iSync compatible devices, all locked to their network.
If you are looking for Bluetooth OBEX [object exchange, for file transfer] and DUN [dial up networking, allowing you to use your handset or smartphone to connect your computer to the internet] then you must be very careful selecting a Verizon handset, as its V CAST devices are not compatible with dial up networking, and many Verizon handsets do not have the OBEX profile enabled, in order to protect the revenues they derive from such wireless plan features as Get it Now.