Snapraids drive pooling feature sucks but that's not really what the program was made to do. If you want one large drive consider Drivebender or Drivepool. Both have this feature at the expense of disk space due to mirroring of your data.
An i5 would be overkill for a HTPC if you are not gaming. Go with the cheaper option, i3 or Celeron.
To give you an idea, I've got a Celeron G540; it allows me to record 3 shows from a HDHomerun Prime while watching a previously recorded show.
We just recently installed this system in our office. Works great.
In addition to what other people have said, I believe there are two versions. A China version with ColorOS and the World version which has CyanogenMod 11S. China versions do not have CyanogenMod 11S written on the back. I also read somewhere about different LTE frequencies but you'd have to...