cheap good raid 5 card pcie -- Dell Perc 5i -- you can get them for less then $200 on ebay with backup battery.
Its a SAS controller, but SAS is backwards compatible with SATA.
Specs: Intel IOP333
256MB Ram (up to 512MB)
PCI-E 8x (pci-e scales to the links available i.e. a 16x card can run in...