So should I get the 6.2 ?
Go for the 6.2. The only advantage of the A2000 4.0 Braunschweig, you can jumper that one with the help of the ramcard in the CPU-socket and the A1000 bootroms the way that it acts like a real A1000.
The A2000 6.2 on the otherhand could easely upgraded to 1mb or 2mb Chipmem.
And remind both are stoneage in the spirit of computertechnology
Markus