Can't really comment on the case situation.
As for the motherboard, I wouldn't bother upgrading. That said you can get an updated B3 motherboard for free (as far as I know it is free).
Quickly and Easily Identify ASUS New B3 Revision Motherboards
From the bottom of that link:
"We would like to use this opportunity to encourage any users currently in possession of affected ASUS products to carry out return and replacement promptly, so that the transition to the revised hardware is as smooth and fast as possible. For additional information and assistance, please feel free to contact your local ASUS service hotline. Check
Change SandyBridge for MB for detailed warranty and service hotline information."
About being free:
Intel®6 Series Chipset Resolution
From that link:
"Free product replacement
US and Canadian Customers: If you would like to have ASUS resolve this issue, free replacement service and 2-way standard shipping will be provided by ASUS. An equivalent/new product will be provided to the customer as part of this program and warranty renewal at the time of replacement*."