Vista - What do you thing about idea of using SATA for Hyper-V?

I’m going to use MD3000i SAN and I need as much space as possible. I can add
only 2 MD1000 so when I use SAS 400GB in RAID 10 it could be not enough. I
need this for about 80-100 Virtual machines and I just wonder about what I
should chose RAID 5 with SAS or RAID 10 with SATA.
I like SATA idea because I can use 1TB drives what will give me plenty of
space but I afraid performance issue. What is your opinion about this and
what advice can you give me.
Thanks for your help.