Taking your space requirements into account, and combined with the fact that I won't suggest RAID0 for any NAS storage, don't bother with the WD Red, because they don't make 4TB drives in that line yet.
Any of the drives in that list should be fine. That's what the list is for, after all. It's a list of drives that Synology has verified as being supported with that NAS unit. However, if you're superstitious enough to believe all of the remarks about various brands that are all anecdotal at best, then I would go with one of the 4TB Hitachi drives listed, because those appear to have the least amount of negative remarks about them everywhere (but one could argue that it's because they haven't sold as many too, so I guess it doesn't matter in the end, or depends on who you talk to.)
If you're dead set on Red's, then you will need more than 2 drive bays, because running RAID0 in a device you're probably going to depend on for backups is not a wise idea.