I use a Rocket 620 on a WHS '11 H61 chipped board, so I kind of see what you're using. It's not purty, it isn't clear, but it's a good screen to work with. At first glance, this seems to be RAW drives and trying to boot from them though. I don't boot off the card and use the onboard stuff, so addition of the other 2 drives are more simple. The Adaptec RAID 6405 was a bit more tricky to boot from.
I think you're really into teething issues with a new build (help me build/buy) and could cure this by simply booting off a board drive to get to the controller or figuring out your particular board's "boot other" selections in the BIOS.
If I have to be snarky, it's the use of a SAS controller with SAS drives in a WHS. Mind you that WD Green Drives do well in WHS builds and SAS are keyed more for "real" servers. If you'd just Keep It Simple, you'd have S/ATA drives plugged into a board and be up and running. If Maximum PC recommended server parts, they should be lashed because it's not the same thing. You don't have an SMP side-banding Xeon in this do you? I didn't read the article because I no longer subscribe for obvious reasons. Last issue I received had duct tape involved, so read into that as you will. I presume they told you that you need SAS drives for a WHS build, and that's flat out incorrect.
Back it up a bit. I'm sorry if they told you this stuff, but you don't need that complication. A WHS is simple, not complicated. No SAS, no RAID...just a basic build that holds and hosts data to a narrow network. It's a server by definition, but not a server. My 1st WHS was a Pentium III w/ IDE drives. My latest uses the up-to-date H61/1155 stuff and isn't faster at all. You don't need fancy server stuff in order to have a server. Again: Keep it simple.