yep. 32mb cache ones are pretty expensive and not available in market! i wanted to sell mine and get 32mb cache and it wasnt available .. they are asking like 4000 for 32mb cache, and they dont have stock itseems.. I bought for 2800 including tax ! I think i will stick to the same 8mb cache as of now !!you can add up to 4 SATA hard drives in your system and 2-4 IDE hard drive (depending on the motherboard) !! It hardly matters about which hard drive you buy. You can buy 4 different make and use it !! For some particular raid, you need to have the same hardware and that is what it is mentioned in the site. YOu dont have to bother much about it ! you can definitely add more than 2 hard drive if you have sufficient slots on motherboard ! These days motherboard comes with 4 SATA ports and one IDE (2 devices can connect) port. So you dont have to worry !