Ok, so RAID-0 (striping) across two SSDs. This should give you
massive throughput and double the space in a single drive.
But just rewinding and considering your system, I'm wondering if you're making it overly complex. Not to talk you out of striping necessarily: I'm just trying to understand your motivation.
- With a decent SSD on a SATA3 port the throughput is pretty damn good already. Are you sure the extra speed is worth it for now?
- As for the space, if you're going to partition it anyway for separate boot partitions for each OS, you could do this with JBODs.
Finally, if this is your first CustoMac I would strongly recommend keeping things simple and keeping things
recoverable. That is, have another device on your system with the Chimera bootblocks (even if it's a USB stick) and have another partition/drive on the system which you clone your OS X boot partition to before upgrades (note that in general your boot partition should be separate from massive datasets, etc). Ideally this would be a different physical drive so that you can repartition and not lose everything.
I might even start with just installing onto JBODs (individual SSDs). Sure, when you've got a little more experience under your belt then add a RAID controller and play with upgrading. But I would be tempted to keep things simple early on (even if for only a couple of weeks). Trust me: as someone who spent 15+ years working in Unix sysadmin, has been an OS X user for almost a decade (and has been playing with a CustoMac for a little while now) there is more than a little experience in this advice...
But if you want to be bold then go ahead. You should certainly learn a lot.