I'm buying a trash can 8 core, should I wait for the $3999 8 core stock version or I can just go with the $2999 and configure it to 8 core? Will the stock 8 core version with $3999 be better than the configured 8 core from $2999 because it's from stock and it offers a better thermal design, so maybe a lower chance of getting into trouble because of the heat? By the way, have Apple totally fixed the heat problem so I don't need to worry about the thermal/heat problem of nMP? If Apple have fixed this problem, then if I buy the trash can now in USA or in another country like China, am I likely to get a problematic one/before fixed nMP in China because China has less nMP than USA so probably I got an old nMP with the heat problem? Is there a way to see the SN number to identify if it's a before heat problem fixed machine or after heat problem machine? Thank you guys!