Core upgrade -> check/recommendations

[WeekendOC]

Hi All,

I am looking at updating my current setup…
I am currently running a Q6600 @ 2.4GHz, BFG 680i, 8GB DDR2, 8800GTX.

Things I wish to keep
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Couple of HDDs with a SSD for my OS.
I have 2 monitors + mouse + keyboard.

PSU is a Corsair 620W HX Modular - will I need to replace this for my new build?
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CPU
Thinking of sticking with the retail cooler initially - bad idea?
Intel Core i7-3770 3.40GHz (Ivybridge) Socket LGA1155 Processor (77W) - Retail
£229.99 (£191.66)

RAM
Samsung Green 16GB (4x4GB) DDR3 PC3-12800C11 1600MHz 30nm Dual/Quad Channel Kit (MV-3V4G3D/US)
£101.98 (£84.98)

GFX
Gigabyte GeForce GTX 560Ti "448 Edition" WindForce 3x OC 1280MB GDDR5 PCI-Express Graphics Card
£179.99 (£149.99)

Motherboard
Little help here! - Any reason for me to pick the Asus P8Z77 over the Gigabyte?

Gigabyte Z77X-D3H Intel Z77 (Socket 1155) DDR3 Motherboard
£113.99 (£94.99)

Asus Z77 Sabertooth Intel Z77 (Socket 1155) DDR3 Motherboard
£179.99 (£149.99)

Asus P8Z77-V DELUXE Intel Z77 (Socket 1155) DDR3 Motherboard
£199.99 (£166.66)

So all suggestions are welcome and advice regarding the PSU would be greatly appreciated.
Budget is fairly flexible - around £700-ish.

Thank you.

 

[WeekendOC]

Bit of everything really... gaming - work - watching films...

Current setup is fine for the work - watching films, just the gaming side pushing this upgrade.

 

[WeekendOC]

Thanks very much for the suggestions Stinger53.
Anyone know if my current PSU (Corsair 620W HX Modular) will need replacing?