Scat cranks are pretty good, I know a lot of people that have pushed them well beyond their recommended limits.
Your best bet is to talk to whatever shop you are going to have do the machine work and build the engine. Just get an idea of what costs are going to be. If your goal is 550-700hp, then you won't be buying all your stuff from one company anyway and certainly isn't going to be some off the shelf kit if you want to put all the best you can afford in it.
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