Hello and welcome to the forums
Well the first 2 links didn't work,but i did a search and the only difference between those Acer's is the screen size.
I would go for either of the Acer models,because the HP one has a slower CPU.
And as for the 2 Acer laptops,it depends on you that you want a 15" or a 17" laptop
I have the Acer Aspire 5740G-6979 and I couldn't be happier. It can play modern games like Dragon Age: Origins, it isn't that loud, and it doesn't run so hot. The 15.6" LED widescreen looks very nice and photos look sharp.
However, there a few minor flaws that you should know about:
1. It does not have GPU switching, so you cannot switch between the HD 5650 & the Intel GMA HD.
2. There will be a loud annoying beep if you unplug/plug in the power adapter, but to solve that problem just uninstall & delete the Realtek driver in "Device Manager". Then download & install the Realtek 2.29 driver version. You can find it on Google.
3. The battery life only lasts about 2+ hours on 40-50 percent brightness. Not sure if that matters to you.
4. It has a one button function for the mouse touchpad, kind of like a see-saw effect. I prefer 2 buttons.
Those are the only flaws I have noticed with this laptop. I still recommend this laptop because you cannot find a cheaper laptop with this class of performance.