I'm with Steve on this one, the whipps was the choice, the B&B one would be a good one also I'm sure, but agreed you'd need to make sure the coolant hose and water pump has extra coverage,
I use a Hyde on my 550 and while the argument is there of plastic over alloy, it's served me well in some pretty full on terrain. The fitment is good but I've added some old front tube material to the clamping system to get a more snug fit against the frame
Good luck with getting one sorted for the 650
Cheers