If you don't use the wi-fi, the JAM is very nice, very small! I found I never used it, so no big loss for me.
I have not used the PDA2k, but have read that both imates are more stable than the 6315. I didn't have a lot of problems with my 6315, but some. And it was on the slow side.
The downside is it is not an official TMO phone (if that matters to you) and the price. And although HTC has a repair center in Texas, I was told my dead pixel would have to go to Dubai 
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Current PDA/phones:
T-Mobile G1
My sordid past:
Kyocera 6035, Kyocera 7135, Samsung i700, iPAQ 6315, iPAQ hx4705, Motorola a630, SE T610, BB 7100t, iPAQ rx3115, JAM 850, BB 8700g, Samsung i320, Motorola v360, imate KJAM, TMO SDA, TMO MDA, TMO Wing, AT&T Tilt
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