Yes I have tested this virtually with vmware.
Replacing disks by bigger ones works great. 
But the new space becomes usable only after replacing *all* disks.
I hoped that new space will be usable after replacing 3 or 4 disks.

I think the best strategy for me now is buying 
2 x 750 GB Disks and using a mirrored setup.

When the storage is full i'll buy 2 new disks 
and concat the mirrored vdevs. At the end when
8 disks are full (4 x 750GB), i will switch 
the layout to raidz and have 7x750 GB available.
I'll have to copy the complete data 
to another disk-storage, but that is ok for me. 
Perhaps zfs will even permit changing storage-layout
from mirror to raidz in the future ...

This should the best working low-cost strategy for me now.
 
 
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