Installing SQL2005 Std. on Win2003 Std. Svr.

I plan to install SQL 2005 Standard on a Win 2003 Standard Server box.  The box is a PowerEdge 2950 w/2x80Gb in RAID1 and 3x500Gb in RAID5.  I plan to install Win2003 on the RAID1 array. 

For best performance, is it recommended to also install SQL on the RAID1 array w/just the data and logs on the RAID5 array, or install SQL on the RAID5 with it's data and logs?

Thank you,
BaliBob