Since my BR drive was less than optimal (the plastic carving) and you want minimal hassle, I would suggest you find a "macfriendly" supplier. OWC has so far never let me down, and at least in my experience, their support is very good. I normally use them for components where international shipping won't be the major part of the price, like it would be in this case.
Their items are probably tested for MacPros but you can always send their support a question, if in doubt.
They are however not the cheapest alternative, but I gladly pay a premium for good support and tested products. 🙂