[CentOS] RAID5 or RAID50 for database?

> Why are you still using CentOS 4?
> 

Do you have an issue with Centos 4? I prefer to wait for RH to work most 
of the kinks with their new releases. Centos 5 has new versions of 
various libraries and software. They have never been able to guarantee 
zero breakage. Eg: I have heard of constantly crashing firefox. A known 
issue too.