MSA 2050 RAID disk groups

Hi,

We have purchased 2 SSD 800GB disks and 5 SAS 900GB. What is the best configuration to set the the Disk groups on Pool A?  We were thinking of RAID 1 on the SSD and RAID 5 on the 5 SAS all of these on pool A.

We are thinking of purchasing next year another 2 SSD and 5 SAS 900GB and add these new ones into Pool B. That way we have the recommended balance on both controllers?

Could someone advice on the best way to do this? We could not buy any more disks as we didnt have any more money this year.

Thanks,