The majority of difference lies in the form factor and radio technology. The WX is the old 650 style body with the stubby antenna, designed for use with CDMA technology from Sprint. (700W for Verizon).
The 750v is the new smaller Treo which is slimmer, has no external antenna and is running a GSM radio with EDGE, 3G and U capabilities. There are other differences and I would suggest Google'ing for comparison info.
I personally am using the 750v, unlocked on T-Mobile and really like it. Has the killer Treo form factor with the Windows OS.
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Thanks,
NP
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