The motherboard is the most vital piece to the jigsaw puzzle, spending too little could be disastrous on performance and also expandability. Spending too much could be a waste of money.
If you are thinking of ever using possibly a second gfx card later on in sli mode, then you must make sure it is an SLI motherboard not an AMD crossfire board or it will not work.
A mid range board from a recognised manufacturer is your best bet. Asus/Gigabyte/MSI generally speaking do the better quality of the boards. something between around £50-£100 will normally be a decent mid range board from the manufacturers i have mentioned. Make sure the board you choose has the right connections for what you require (sufficient sata/ide/pci slots etc).
Look into your choices then check out the manufacturers full specs on their websites. Everyone here will have their preferences on components and each will be different. So make you own best informed descision based on the price/quality/connectivity/compatibility of the board you choose.
Hope this helps, i know i wasnt very specific to a particular board but its always best to make you own informed descision by checking out the hardware specs for yourself.
Oh and a slight note on your BIOS update for your card. Be careful, make sure he knows what he is doing and he is responsible for any damage. BIOS changes can cause mayhem and overheating if pushed too far. I doubt that card will get much more power out of it than the defaults that would be visibly noticeable. Just a word of warning, but dont be afraid to experimenting if they know what they are doing!
Edited by High500, 02 July 2009 - 06:44 AM.