@USAFRet: No i didn't mean to imply that I would use a 240GB drive and a 480GB drive. I simply was stating the capacity of two drive types I could use. I would have used either 2 240's or 2 480's. (The one thing I always kept in mind with RAID was same disk size for every disk. Otherwise it just goes nope)
OK, just checking.
Many people DO assume it would just add. NOT!