HP Proliant Server Question about Hard Drives

I am looking into a new Server.  I found this one:

http://h10010.www1.hp.com/wwpc/us/en/en/WF06b/15351-15351-3328412-241644-3328421-3579900-3709641-3728103.html

It would fit all of our needs except the fact that it will only have 1 TB of total storage Size in a RAID 5 with it's 8 x 146 GB Hard Drives.  Would it be possible to add 2 standard SATA2 1TB Hard Drives and configure them in their own RAID 1 to have an extra TB of storage space?  Or do I have to get the SAS drives?  I know they are faster but they are smaller and I would have to add another 3 x 450 GB HDD's and put them in a RAID 5 as well just to get another TB of storage.  Not to mention they cost over $600 a piece when I can get a standard SATA 1 TB drive for around $150.  

Please let me know what you would suggest.  Should I just get this AS-IS and add a 2nd Storage Server?  

Thanks for your help in advance.
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kadafitcdAsked:
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lnkevinConnect With a Mentor Commented:
SAS to SATA is backward compatible so the answer is yes. If the link you provided is correct, you can go up to 8TB on this server. However, in any cases, you can replace SAS with SATA if you need more space less performance and budget.

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kadafitcdAuthor Commented:
Thanks guys that's what I needed to know.
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