The HDPro and HDOne have very similar performance. The HDPro will give you the top-of-the-line features, and provide the quietest array. The HDOne is very quite too. I find most Mac Pros are nosier than these units.
As far as playback, the HDPro and HDOne will do about 440MB/s sustained with RAID 5 protection.
ProRes 4x4 playback will not be an issue for these guys at all.
The HDPro and HDOne do not use mini-SAS, but rather external PCIe. CalDigit does offer a longer cable option if you need it. I think you'll be very satisfy with the noise level though. Frankly compared to many of the rack mounted arrays like the XServer RAID, it's night and day.
Short story. Was helping with an install, where they had an HDPro and older XServe RAID. We got the HDPro up and running and then hand gone to another floor of the building. All of a sudden we heard a sound like someone was vacuuming on the ceiling. We went outside to look, but it turns out the XServe RAID was turned on on the floor below us.
Don't hesitate to ask if you have any additional questions.
Jared PicuneCalDigit. Serious Storage.Denver Final Cut Pro UGGeeky Mac | FCP Tips & Tricks
