After much deliberation, I've decided the one I want is the i-Mate SP3i.  It's much more aesthectically pleasing IMHO and gives me everything I like about the Audiovox SMT 5600 / Orange C500.  I got a lot of good information about the phone from BengalBoy's SP3i review on HowardForums.  Thanks to a few other reviews such as the Audiovox SMT 5600 vs Motorola MPx220 review on MobileGizmo and Another 5600 Review by Dominick on HowardForums, I got a lot of good feedback on the 5600.  I was leaning towards the 5600, but after his review, I was sold.  I really like the XDA IIs/III, but the form factor is just too large.  I love the thumb-board, but form factor was the major con on those guys - although that huge screen is oh so choice!  It's really unfortunate that there is no flip-open thumboard like on my Nokia 6820 (other than the Voq SmartPhone).

Expansys-usa has it for $449.
PPCW.NET has it for $454.

Anyone seen it cheaper elsewhere?