No I want something like this
2tb (1)
raid 5 with
JBOD
250gb (2)
500gb (1)
200gb (4)
raid 0 with
160gb (1)
JBOD
80gb (2)
the rest with JBOD config consist of 120gb or less to make one drive
This setup still doesnt make sense, because if you add a single disk(vdev) to and existing Mirror/Raid and this one fails you lose all your data.
(BTW how much sata/IDE connectors does your mainboard have oO with this many drives?)
Your should think abort discarding your low space drives and buy 2 or 3 newer ones (2TB++).
But if you still want to keep the old ones, i would go with the following setup
80gb (2) => Raid0 /Mirror (i dont think raid0 would make sense,because they are slow as hell even after combining them to a raid0)
2tb (1) => buy 1 (Mirror) or 2 (Raidz) more of 'em or use as Single datapool / external drive / Backup Media
250gb (2) => Mirror / Raidz with the 500G (your lose half of the disk)
500gb (1) => Single datapool / external drive / Backup Media
200gb (4) => Mirror (create with 2 and then add 2) / Raidz (less performance, but more space)
160gb (1) => Junk / Single datapool / external drive
As you see you would end up in very little space, that takes quite some engery (think about your monthly bill) and multiple pool that cannot be combined.
Srly buy some 2TB drives and use 3 of em in a single raidZ to store your important data, backup to aother datapool out of the 200-500GB (that would be 1,2TB of space) drives and trash the rest.
Else if you dont mind losing your data, throw all drives in a JBoD and pray that you never have badblocks or a disk error.