Updates for aac(4)
If you are confused that the aac(4) driver says you have a SCSI controller even though you have a SATA controller (or vice versa), update to the latest CURRENT, or RELENG_6 in a couple of days. Several device names have been corrected.
Moreover, the aac(4) manpage now actually lists all supported controllers. If you are shopping for SCSI/SATA/SAS controllers, this may be worth a look.