Don't worry about the hard drive. It is somewhat worth it, but I don't use one, and I have no need for one either (I have a g73.) It will make Windows boot faster, and it will improve games a tad. But like I said before, I don't use or need one, and I play games on max with no problem.
You'll benifit from getting the extra gigs, but 4 will suffice, besides, if you were to upgrade, you'd be paying a lot of extra money for those 4 GB of RAM, You can just stick to the 4 GB.
For gaming, that Vortex laptop is your best bet, if you want to also do programming, video editing... business related stuff, the Asus would give you a few nice features.
Stick with the Samsung 4 GB 1333 Mhz,
Your CPU is fine, upgrading will make the price go much higher... And the performance increase wouldn't be worth it.