Opinions will vary a bunch which is fine as I'm sure individuals will recommend what they've had good luck with. I would imagine there are a ton of scats and eagles running out there without issues in your hp range plus..... For a NA application I personally would look into the Lunati voodoo as gpm mentioned otherwise the Callie's compstar. When I checked with my machine/speed shop for my builds they recommended the compstar as they've used on many decent power yet budget builds. Higher HP SC builds I'd tend to stick with US forged only yet again there are still plenty of overseas forged 4340 cranks finished in the US with good luck. The snouts in higher SC HP builds can become a week point. There's molnar and K1 also. I ended up with compstar and checked out perfect.

You can do a lot of reading on different forums. Regardless my recommendation would be to purchase one that is finished by a reputable well known US crankshaft company. There is Ohio crankshaft also however I've personally heard of a few of them brake. Good balancing on rotating assemble is cruicial no matter what you end up with.

Definately 8 counter weight.

Yes they are and are some deals on them right now also. Seems like I just saw them somewhere for around 850.00.