I am looking into getting a new server. One thing I'm not sure about is transfer speed vs rotational speed. I was looking at doing a four-drive RAID 10. I would like 15k rpm SAS drives because this server will have a lot of reads/writes. On the particular configuratoin I was looking at, they offered 146GB 15k drives that were 3Gbps and 300GB 15k drives that were 6Gbps. Obviously there's a significant price jump from one to the next (over $200 per drive). Would RAIDed 15k rpm SAS drives even warrant the need for the jump from 3Gbps to 6Gbps?