what raid system should i purchase for freebsd ?

[ei02435 at student.estg.iplei.pt]

I would like to install freebsd in a machine with a raid system.
 
So somehone have told me that linux sometimes dos not recognize some raid 
systems ...
 
can any one tell me what raid system can y purchase to have a garantee that 
freebsd will recognize im ?
 
i want to use RAID 1 (mirror)  system with 2 hard disks .
 
 
Tanks a lot !
ei02435