New
#11
Not sure what graphics card you are going to use after your first rebuild, but generally I'd take those PSU calculators with a serious grain of salt.
I damn sure wouldn't buy a new PSU that would not also work when I switched from a BTX to ATX case at some later date. If I thought I was going to be forced into that, I'd just wait until I could upgrade to an ATX case and PSU at the same time.