cubic inches vs. head flow vs. rpm

Here's how I see it, there is basically 3 different categories.
First would be what I call basic. Production block, production heads and I'd even throw eddys in there or any head where the ports resemble a stock port. I beam rods, factory cranks and 4" cranks are the norm it seams. The combinations seem to top out around the 500hp mark.
Next would be moderate. W2's and other aftermarket heads come in to play here. Usually still production blocks with the addition of H beam rods and stroker 4" cranks are used. These builds seem to target a 600 hp mark.
Last would be aggressive. After market blocks, high end cylinder heads, H beam or aluminum rods, 4+" cranks and even some exotic parts. I would consider this category a max effort with a 600+ hp goal.
Now the disclaimer, this is a very basic break down of how I look at it. I'm sure someone on here has or knows of someone that made 1000hp with a stock block, crank and heads. There is overlap from one category to the next with any combination of parts used.
Also, I've been told camshaft lift and compression is your friend for making power so I would look at maximizing those to the combination of parts you chose.