I'm looking to upgrade my XV6800 to an Omnia, a Diamond, or a Touch Pro (i.e., another Windows Mobile phone). I'm eligible for VZW's "New Every Two" discount. I just finished reviewing many of the posts on all of the devices' forums. I also spent considerable time comparing the sites on VZW.com. In a nutshell, these seem to be the major differences--in my modest and subjective opinion:

Omnia

Pros
Thin and stylish-looking, especially compared to the Touch Pro
8 GB of internal memory
5 MP camera

Cons
External, corded stylus
No slide out keyboard
Appears to have less Storage memory than my XV6800's 150 MB; not sure how the XV6800's 46 MB of Program memory compares


Diamond

Pros
Higher screen resolution than the Omnia
More Storage memory than the Omnia (appears to be comparable to my XV6800's 150 MB; not sure how the Program memory compares)

Cons
No slide out keyboard
"Blocky"-looking compared to the Omnia


Touch Pro

Pros
Higher screen resolution than the Omnia
Even more Storage memory than the Omnia; not sure how the Program memory compares
Slide out keyboard

Cons
High price
Usability between battery charges
"Blocky"-looking compared to the Omnia
Seems to be more reports of instability compared to the Omnia


Is the Touch Pro's slideout keyboard the major difference between it and the Diamond?

I appreciate any additional comments and/or first-hand experiences comparing these three models.

Thanks!

I Personally would go with the Omnia, although my highest recommendation would be to wait as the newer models of all these phones seem less than 6 months away.

Yes, that's the major difference.

The Diamond also has visual voicemail and should have very slightly better battery life according to Verizon's specs:
Usage Time: 300 vs 250 minutes
Standby Time: 375 vs 350 hours

I don't know if Verizon charges for visual voicemail, doubt it, and if they do, it's not worth it, 'cause it's not the cool kind that you can add (to the TP also) that also gives you the text of the VM that you can read and keep a text record of, in addition to a recording. I like having the option of reading my VMs, especially when I'm in a meeting and sometimes it might be nice to have a text record.

Because the Diamond is newer to Verizon it seems like it might have some improvements over the first TPs, but I expect that any improvements are being incorporated into new TPs, eventually at least.