I have never used the Octogon controller, but I have used GVP. The GVP stuff is good, but get the newest versions you can.
It is generally best to have your accelerator work as your first SCSI interface too. It speeds things up. If your accelerator does not have SCSI, and you can't find or afford such a card, any of these should work - The GVP will most likely work with more hardware and software however.
