I will suggest you to change the processor because for a budget office or video editing works a 3770k is not the bang for the buck.
Processor - Intel Core i5 3570K (If u overclock it in future or so and if not then buy 3570) - 219$
Mobo - MSI Z77A-G45 - 100$
Computer Case - Corsair 200R (If u don't use Water Cooling) - 45$
Corsair 400R (If u use Water cooling and needs a lot of expansion slots as well)
And everything else is superb.
If you aren't overclocking then why waste money on a K model CPU/Z77 board
Go with an H77 motherboard and the i5 3470 - At stock speeds it runs just as fast as the 3570K (real world performance) and the H77 is a board for non-overclockers while drastically reducing your cost.
For your case just choose something that looks nice to you with sensible cooling.
These savings could help you when choosing your GPU.
Thanks for the replies guys, they were very helpful.
I have following questions:
1. Apart from overclocking will I lose anything else if I go for 3770 instead of 3770K for the processor?
2. Same question for chip-set too, will I lose anything else apart from overclocking if I got for H77 instead of Z77?
3. Do I need any specific requirement on chipset if I have to add a bluray writer or does it work irrespective of chipset type?
Please check the revised config below and suggest improvements:
1. I am planning to buy a high-end graphic card later (like GTX 680, but for now use i7's onboard), so the motherboard has to be compatible.
2. I am looking for a fancy looking tower at lower price and compatible power supply for this setup.
3. I forgot to mention last time that I'm looking for an economical bluray writer too, so please suggest one.
you do not need a specific chipset to use a blu-ray drive or a specific motherboard to use a high end GPU. you dont lose anything from going z77 to h77 other than the fact that no one makes a SLI ready h77 board. but you arent doing SLI so its irrelevant