I just visited Cingular's GoPhone site and they have refreshed their lineup somewhat, adding some phones...that are only available to Pick Your Plan users. What a rip. But anyway...
The Motorola c139 is now $30 on both Pay As You Go and Pick Your Plan
The Nokia 6102i (with Bluetooth) is $120, on Pick Your Plan only (at least for now)
The Firefly (!) is $50 on Pick Your Plan only
The Pink Razr is $200 on Pick Your Plan only
I think that's it as far as new phones. The Razrs have been $50 cheaper on Pick Your Plan for awhile now ($200 vs. $250).