Just for the sake of anyone else researching this issue, ill post my findings:
I Emailed ECS to see what they would do for me in the event that the BIOS update kill my board and got this response:
"If your BIOS flashing fails then you can contact the RMA department for a replacement.
Here is the link to the BIOS page.
ECSDOMAIN/ECSWebSite/Products/ProductsDetail.aspx?detailid=565&DetailName=Bios&MenuID=1&LanID=0
How to flash the BIOS
ECSDOMAIN/extra/flashutl/amiflash.htm"
I also emailed a guy who had this issue and was told that doing a BIOS update did in fact kill his board (NOTE: I don't have any idea how this person performed the procedure.) and the issue was never resolved after weeks of troubleshooting. He finally just bought a new DIFFERENT board.
So... sounds like it's a gamble..
I may just take the risk, update the BIOS, and get a new board if it messes up then send this one away for a replacement.
I am yet to find any concrete evidence that doing the update will in fact allow Vista to run.
Again Ill post my findings once I'm done..