Long story short, I had 500 Euros wanted to be transformed into a new pc. My problem was that the new build should at least match the performance of a Mac Pro 4.1 dual X5550 that was being used by my wife OR me, decided by will strength (So mostly her). The alternative would be to build a cheap "pink" pc for the wife mainly for office, internet browsing etc, freeing the mac pro for me (office, internet browsing, and Dragon Age III, Fallout 4, and other games).
So, I ended up building this little imp, using the GPU, SSD and mouse from the Mac, for the 40" TV in the living room and given the budget I believe I did well: 1. Booting time: a few seconds compared to a few minutes for the Mac; 2. Sata III instead of Sata II; 3. Upgradeable in every way. The Mac can't be really upgraded, except for the gpu. (Actually there is a way to upgrade to dual X5670 and 1600MHz RAM, but one X5670 still costs more than 1000Euros!); 4. Better performance for Fallout4. I believe this will be true for DAIII and any other game I'll try.
Things I would change if I really could: 1. A semi-modular psu to cut down about an hour trying to hide the extra cables on the back from the building time; 2. A windowed case and a better looking cooler for showoff. I believe I will be trying to cut a window in the near future... and ending in buying a new case!
UPDATE: I replaced the 2 Cooler Master fans that came with the case with 3 Arctic Cooling F12 pwm fans, and I added a second ssd (Samsung 850 EVO 120G for Windows and Programs, and 840 EVO 250G for games) and an s/pdif out I salvaged from an old pc. I added some better quality pictures as well.