That mobo's manual says it uses an Intel ICH7R Southbridge chip to provide the on-board disk controllers including the RAID capabilities. Your best bet, then, is another mobo with the same chipset, especially that particular southbridge.
BUT check Intel's website on this question. Some makers can tell you they have maintained RAID compatibility from one chipset to a newer one within limits, so just maybe other Intel chipsets can handle that RAID set properly. I'll tell you one thing that likely is VERY important to know, though. On the old system with the failed mobo, exactly which HDD unit was plugged into which SATA port number? Raid systems arrange data on disks according to which port number they are attached to.