When you get the new machine up and running and have everything moved over, then taking the old machine to linux may be a good way to learn. That is how a started playing with Linux long ago.

The hardware selection isn't bad. I wouldn't get a seagate for my systems, but everybody has different preferences. The rosewill case will not support a corsair h100i in the top of the case if that is something you need. I did see a 7770 by MSI for 75 dollars after MIR this week. The card may depend on your order time/current deals/budget. I think its missing a dvd drive as well.