Well, it depends. Do you need a new system up and running right now or can you use your current computer for a bit longer? If the latter, maybe you go ahead and send the motherboard back in and build in March or April. If you need it now, go ahead and build and take advantage of the replacement program in March or some time later in the year when it's convenient for you to tear down your build, ship the motherboard off, get a replacement, re-license windows and be back up.