Hey, can someone help me

[AdamB]

Hey guys, i got my computer 9 months ago but made the classic mistake of going cheap and not getting the best components i could for my money. anyway, i decided that i need to get some decent harware to boulster my system so i can play games like Arma 2 and Arma 3 in the future aswell as IL-2 ClOD and the Crysis Series. Please can those who have expertise in this area help me out, but i dont want this turning into a discussion about how ATI and AMD arent as good as Nvidia or intel, because I would just like you to offer your advice on the questions below, lets not start a competiton


Here are my current system specs:
AMD phenom II X2 560 BE
Asus M4N68T LE-V2 motherboard
Palit GTS 450 (the store i broght it from said it wasnt a palit so i got screwed)
400w Xigmatek PSU
Xigmatek Asgard Tower gaming Case
4GB cas 9-9-9-24 (2x2GB) 1600Mhz RAM (Dual Channel)
12X DVD drive
500GB Hard Drive 3Gb/s (S-ATA II - i think)

1. Could someone recommend a good site (uk only) to buy PC components for the lowest, other than Scan.co.uk - this is the cheapest site i know at the moment and where i could be buying my components from

2. Should I buy an i7 with Z68 or P67 motherboard with my current hard drive, as the Z68 doesnt have the problem that the P67 mobo had with S-ATA II devices connected to its SATA ports

3. to make things more confusing I found a bundle deal to buy an AMD phenom II x6 1090T @ 3.2Ghz and an Asus, Point of View, Charged, Nvidia GTX 560 2GB (not the Ti version), is this better than upgrading to an i7 (with mobo) for the games stated above

4. Is the Asus, Point of View, Charged, Nvidia GTX 560 2GB better than a standard GTX 560 1GB

Thanks for any help.

AdamB