Have to agree with the consensus here in that; pic one and don't worry about it. By the sounds of it your still in the acquiring stages of the build with that being the case I wouldn't even offset grind a stock crank $$$. That is unless you get in a pinch and need parts now and they are only available for that combo. But it seems the 451/511 low-deck has the most 'shelf' options AND plenty of it floating around 'used', if you're on a budget. Also put some 650's OR 750's on that TR.