RAID SCSI or SATA???
1. be sure its a 10000 rpm SATA drives (there are 7200 rpm drives wich is as slow as IDE). We tested WD Raptors recently - they are hell fast!!
SATA RAID is the same as SCSI - controllers are the same in terms of reliabity, mechanical parts of scsi & sata sometimes are equal too. But SCSI is smarter (for example it could sort commands in controller memory - so drive could perform it more efficiency), so it means it make less load for HDs and it means more reliable.
Don't know what is AS or BGP. See glossary. We did it special for our site visitors.
Know word definition...