BooOOOOo
Currently looking into the same phone. This or the Treo650 (no 700w GSM yet with Cingular).
If you have not held the 8125 (HTC) , it is a little smaller than most PDA Phones, feels cheap and plasticky. The slide out keyboard I am sure is a novelty that will soon wear off. I also had trouble dialing using the screen numeric pads as compared to my existing Treo 600 as I can dial using the keypad without looking (think while driving
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Having said that, 8125 is probably the best PDA style Phone that Cingular has in terms of features and functionality. The Treo does feel much solid but the main difference between the 650 and the 8125 is Wifi (don't use that much), slide out keyboard and a low resolution screen on the 8125.
IMO the 8125 is more of a PDA than a phone. Also heard that battery life on the 8125 is not that great and open a few applications and the OS will crawl to almost a stand still (wonders of multitasking). I usually charge the Treo every couple of days with low to moderate use. Treo is a great phone but not that good a PDA. How about waiting for the Moto Q?