I have a bow that's almost identical to what you're considering, except mine is 66 inches. It has a dished grip. Craig's locator grip would probably be better for consistent hand placement, but the difference between them is quite small.
You might want to consider a 66-inch bow. Mine is marked 46#@28, but scales 48#. That's fairly common for Hills. A lot of them are a few pounds heavier than marked. The reason I suggest 66 inches is that to make a 68-inch bow of the same poundage, it's necessary to beef up the limbs quite a bit. More limb weight detracts from performance slightly and contributes to increased hand shock. On the positive side, it adds to overall bow weight, which can make the bow a little easier to hold on target.
I've just always found 66-inch Hills to be a little more lively and quicker than 68-inchers of the same poundage. I draw 28 inches. With a 27-inch draw, 66 inches wouldn't be overtaxing it. It would still draw very smoothly.
Something to think about. If possible, try to shoot a bow of each length in a similar weight range before you place your order.
Good luck in your selection. Can't go wrong either way.