Trying to simplify something is not ignorant. If all you know about these cranks is so important why not post what you just did now, instead of commenting with an insult. He's looking for opinions and that's what I gave him whether you wanted to go further from what I said its up to you but it really boils down to how much he's willing to spend and if he wants to spend the price of 75s when RDs do just as well.