[CentOS] RAID performance design? /home and os

I'm considering how to design a new file server with a 3ware 9650se RAID controller. How much would you estimate the impact to be on sharing /home and the operating system on one raid 6 set? /home is mostly read only accesses with a ratio 10:1 read/write. I'm a little bit concerned that the log writes in /var/log could impact read performance on /home causing disk head movements or that a little/non issue with modern Raid controllers?

What would give best performance Scenario 1 8*500G Raid 6 /home and operating system

Scenario 2 6*500GB Raid 6 /home 2*250GB Raid 1 operating system

Looking for feedback Chris