moving from ATI Radeon HD 2400 XT with 128MB memory to 9400m useing system ram is a down grade and at $1,199.00 or more will just make apple look bad next to psystar.
The mac mini should have 9500 / 9600 or better in the $700 - $900 system.
1. It could be a cheaper configuration, which is sorely needed.
2. It doesn't stop Apple from using a discrete GPU as well in the other configurations. 9600M seems an obvious choice. Maybe even an ATI 4650 or better...