SAS 6/iR is good only for basic RAID 1 - you CANNOT grow the array later. It can do non-RAID.
PERC H200 is basically the newer version of the SAS 6.
PERC H700 is also supported in the R610. It CAN grow an existing RAID array by adding disks to your RAID 1 (converting to RAID 5) or to your RAID 5. It is a high-performance controller and has either 512MB or 1GB of write cache. It does NOT support non-RAID.