Well, actualy yes, modern boards perform better nowadays.
But there's two points that require bigger boards:
1. Floating in powder. No matter how techie your board is, you cannot get a nice float with 161W board, once you're 200 lbs.
2. Carving abilities. The more edge you have, the better yor grip is. That's it. The more stiff your board is, stable you go.
That Venture is nice, especially in 180 cm. May be i'm missing something, but it was more fast boards before: Supermodel X 172, Unity dominion pintail, etc.
Honestly i've just ordered mine some nice board for my needs, and started that topic day ago. Just to check that i'm not missing a nice board for the money: big and fast.
I'm quite surprised that you didn't mentioned custom-build boards (well, Venture can be custom, i think): Prior, Donek, Coiler, etc..