Seperate or Combined RAID arrays?

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http://serverfault.com – We're discussing options for a new server. 8 users, SBS2011, Exchange, SQL We have one supplier recommended the following drives: 2 x 146GB SAS RAID 1 - used by the virtual host operating system 2 x 500GB SATA RAID 1 - used by the SBS servers system and data drive 2 x 146GB SAS RAID 1 - used by the SQL server Is this a good / recommended way to structure these drives? Would we not get more performance benefit from combining the SAS drives into one big RAID10 array? (HowTos)