I'm not really a fan of RAID for most desktop usage, but in this case it's nice to have because it's ATA66. I'd just use it in single drive mode.
It's a cool board. The BE6-II and BX133 (it's socket-370 equivalent, which seems to be pretty rare) have more tweaking options in the BIOS than I've seen on anything else. However, it's important to note that 440BX ABit boards have bad capacitors (I think universally so). They have to be replaced. Once that's done, they're awesome boards though.
It's sad to think how many of these boards ended up in the trash because of caps, but I think that's what killed most of them off a long time ago. Other than that issue they're probably my favorite 440BX motherboards.
I think all BE6-II boards will support coppermine voltage, but I'm not certain.
Generally speaking an awful lot of slot-1 boards have a VRM that supports Coppermine voltages, but your chances are best if you stick to later boards. The SE440BX is an early 440BX board so it's probably too old for it.