1 and 3 are way overpriced. Number 2 sounds decent except that huge power supply.
If you don't game and just need an HTPC then you should stop looking at CL and get an Intel NUC with the Haswell i3 or i5 depending on your budget. Add 4gb of RAM and a 60gb or 120 gb SSD and run Linux (free) or Windows 7 or 8 if you have a licence sitting around unused.