Unless something has changed that I don't know about, yes, you would probably want to use disks of the same size. I don't believe you HAVE to, but the useable space on each disk would be that of the smallest disk. So, in your case you could only use 160GB of your SATA drive, giving you a total of 320GB in the RAID set.
That's cool that your motherboard will allow you to mix the interface types to create a RAID set. You can tell how long it's been since I've purchased a new PC motherboard... sigh.
Ah, well, like I said, I haven't used software RAID. My box at home does have a hardware RAID, but that's it.
I'd be curious what others' opinions are on this, too.
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