Also, you should invest in Power Supply and Motherboard, who knows, maybe you'll have money to upgrade in the future. Once you upgrade your GPU, you'll need more powerful and stable power supply.
Anyway, please reply to these question:
1. Are you hard-core gamer?
If yes: go for the G.Skill RAM, Corsair Vengeance is pricey, but you can buy it if you're planning to upgrade next time.
If not (mid-gamer): go for the Kingston RAM, 2x2gb or 1x4gb. Kingston brand is trusted, reliable, and proven in the world of memory.
If yes: go for the i5-4460
If not: Buy the i3 4150. Currently, I have AMD Athlon II X3 Quad Core 3.2ghz (paired with GTX 650 ti), and there's no problem in playing BF 3, Ghost Recon Advanced Warfare, Sniper Elite, and Call of Duty Modern Warfare 3. Take note, my AMD Athlon is inferior and has lower benchmark than intel i3 above. This i3 also has Hyperthreading if I'm not mistaken. You can multitask your work without or with minimum lag.
I recommended you the Thermaltake for the PSU because it's better to be ready in the future. I'm sure you'll want to upgrade your parts. You need more than 500Watts of PSU if you want to upgrade.
The problem if you have bought lower watts PSU and you want to upgrade your system, you'll also need to upgrade your PSU, and therefore, spending more money in the long run.