I don't know the Acer V3 specs right off so I cannot tell you, but here is a comparison for the other two.
First, easy to mistake but the y410p doesn't get SLI. There just isn't enough room in them I suspect, but Lenovo only sells the y510p models with SLI, and thats only the more expensive models.
Here is the general important hardware though. ACER:
http
/www.notebookcheck.net/AMD-A-Series-A10-5750M-Notebook-Processor.92882.0.html
http

/www.notebookcheck.net/AMD-Radeon-HD-8750M.87147.0.html
Lenovo:
http
/www.notebookcheck.net/Intel-Core-i7-4700MQ-Notebook-Processor.92959.0.html
http

/www.notebookcheck.net/NVIDIA-GeForce-GT-755M.102020.0.html
In terms of CPU performance off these benchmarks the Lenovo at $780
http

/shop.lenovo.com/us/en/laptops/ideapad/y-series/
Of which I highly recommend the $780 y410p because of better processor and screen resolution, anyways that one in terms of CPU power will give 333% of the CPU in the Acer.
While the Graphics in the Lenovo will give you 208% of the performance the GPU in the Acer would give. (Based of Bioshock Infinity High quality FPS)
The Lenovo is much more future proof and much better performance, I actually didn't realize to what extent until I compared these numbers. I would say get it for sure.
As for future proofing though, while the Lenovo is a great system, I don't think a laptop is made that will max all games currently. Its just too much to fit in a laptop.