A true hardware RAID controller would probably cost almost as much as the server itself. Just about all of the cheap (so called) SATA RAID controller cards are some flavor of fakeraid. A few are supported as DM Raid under Linux, but many are not.
Which is funny because Intel's SASUC8i (rebranded LSI3082E-R) is true hardware RAID which I recently picked up *new* for $150. They don't do RAID-5/6 or have a BBU but IMO you don't need a BBU for RAID-0/1/10.
Where can you pickup a new server for $150? :-P