Performace/Raid with large databases

Hi,
we are running large web applications, database sizes are in some cases 
8gb and above.
I have a new server to install with 7 32GB U160 discs and can chose from 
an adaptec raid controller or icp.
 From what I heard the adaptec is in raid 5 very slow and my experiences 
in another server seem to confirm this. I hardly get read/write of 
9MB/s. Besides the icp has a faster onboard cpu.
The icp should be the one to use.

The server should have one partition for transaction logging and one for
view rebuild. I have seen a similar machine not swap out too much with 
1gb of ram so one of this partiion can share with bs/swap.

My question is, should I use raid 0+1 or raid 5 for these databases 
(data directory)?
I have 4 or 5 disks left.
Thank you for any advice.

Gruss
Rainer Traut