Dp1 leather(like) case with grip
The fit of the fake leather cases is quite snug, so likely a grip would not allow a fit. The lower 1/2 case would be a more than adequate substitute for the grip.
As for another poster's concern for heat, I haven't noticed a problem, but it is something to keep in mind. In practical use of the case, the top portion usually needs to be removed, so only the lower1/2 case is on the camera when it is on and being used.