Intel® Core™ i7-4700MQ Processor (6M Cache, up to 3.40 GHz) with Intel® Turbo Boost Technology
8GB DDR3L 1600MHz (4GB + 4GB)
500GB HDD (7200rpm, Serial-ATA)
3GB GDDR5 NVIDIA® GeForce® GTX 770M w/NVIDIA® Optimus™ Technology
DVD SuperMulti (+/-R double layer) drive
Premium Frameless LED Backlit Raised Tile Keyboard with 10-Keypad (black)
17.3" FHD TruBrite® LED Backlit Display (1920 x 1080)
Wi-Fi® Wireless networking (802.11b/g/n)+ Bluetooth 4.0
1 month trial for new Office 365 customers
Norton™ Internet Security 2013 (30-day trial subscription)
1 Year Standard Limited Warranty (1 Year on Battery)
1. either 8gb ram or 16gb ram because I know 12gb ram have some issues with different sticks?
I know 8gb ram is ok for gaming but it can be less for upcoming games! Is it worth spending money on 16gb ram?
2. either 500gb 7200 rpm HDD or 1tb 5400 rpm 8gb Hybrid HDD?
I know hybrid hdd can boost my system but in contrast it comes with 5400rpm hdd as compared to 7200 rpm hdd which will be faster and value for money?I don't worry about space.
I'd get the hybrid bro. Even though it spins at 5400 RPM, the cached memory will be the speed difference. The OS and the "always used stuff" on your PC would be stored in the cache or your hybird HDD, so there will definitely a speed boost.
8gb of RAM is fine any higher and you would be using CAD or heavy image manipulation software, 500gb on a hard drive is plenty (pun intended). I'd get an SSD for first drive to hold OS and then get a good 7200rpm HDD, then depending on how your playing these games online or offline get a good NIC probably either Intel's 450mbps N or an AC 867mbps with a good router.
Games at the moment take up to 2gb of RAM on a good day + OS another 2gb of RAM, up and coming games will be up to console standards so 8gb is fine it's what PS4 and Xbox One have, don't spend more than you have to.
Get a either a glossy (which makes a difference in terms of contrast, colours and clarity) or a matt screen (anti-reflective at the cost of clarity) depending on what you prefer.
Lastly chose a better processor cause 4700MQ is 2.4GHz up to may be 3Ghz if your lucky, the 4800MQ is the 2.7Ghz up to 3.4GHz your thinking of they both have hyper-threading but if its speed your after go for the 4800MQ.
At the end of the day your probably spending about £900 for all this, why not spend about £100 for a lot more power and is future proof.