AFR SBM Heads, Just got back from PRI
Both SB heads look like the readily available generic/offshore castings with whatever proprietary CNC program each vendor uses. If so, they are a somewhat common recipe these days offered by several small-to-medium size vendors. Most are around the same price dependent on what type of valvetrain parts you want.
If these castings can accommodate decent airflow (290+) then the offset rocker type of head gets less and less appealing. For an all-out race motor these are not the answer but for the street/strip crowd these are a good choice.
Companies should be aware of not offering too many redundant products though. I know of at least 5-6 vendors you can get this type of head from right now.