Difference of different versions of true

they are only going to be different by a couple of degrees. Just a get a regular true and you will be fine

Yep, the main difference between the two aluminum ones is color. A black color will radiate heat slightly better, but its an extremely small difference.

The copper one will transfer heat quite a bit better and its additional mass allows it to soak up short term energy spikes without heating up as much more easily. I'd worry a but about hanging that much weight off the mobo though. Its also way better looking in my opinion.

Lapping whatever you get will typically give a significant improvement in cooling.

i'll probably buy the aluminum one then.. it doesnt need any string support or whatever so it wont snap the mobo right?

There's no real difference from the TRUE and TRUE Black. There is a difference with the Copper TRUE though. (Simple answer)

It won't snap the motherboard if you don't sit on it yourself.
And you shouldn't try commuting with the whole motherboard with the TRUE especially if you are putting it vertically in a case.