Recommended Raid Card for Macpro 3,1 with future updates in mind

I have a Macpro 3,1 with an Apple Raid Card (yah, I know) and four internal disks (2 Fujitsu 147G SAS 15K drives, 2 Samsung 1T SAMSUNG HD103UJ drives) all configured as JBOD. I also have (had) a Highpoint Rocketraid 3522 two port mini-SAS connected to a Proavio 8 bay external enclosure with short mini-SAS cables, and housing 5 HD103UJ drives in initially a raid 5 and subsequently raid 10. I won't contribute to the many Rocketraid trials & tribulations (except to say we would never have made it to orbit with this rocket). I've run OS 10.7.3 but backed out to 10.6.8.

I'm looking for a future-proof (e.g. 6gb) raid card or even HBA that has good support for Mac OS and doesn't require you to rip the card out and boot with Dos, etc. Considering ATTO, Areca, Caldigit, and OWC has cheap product (Newtech - looks suspiciously like 3522 - don't know what chip it's using). Recommendations for a card that would allow me to either replace Apple Raid card, or co-exist peacefully would be most appreciated.

Thanks, John