building a rig for the old man, gaming at 1280p, lots of lightroom use, some video editing, upgrade from a Q6600 system, I hope I can build him a nice upgrade 
Already has a 560Ti and a case (though I'm tempted to get a better budget case).
Looking at purchasing:
i5-3570K oem
Cooler Master Hyper 212 Evo CPU Cooler
Gigabyte Z77X-UD3H Intel Z77
Kingston HyperX Genesis Grey 8GB (2x4GB)
Samsung 256GB SSD 830 Notebook/Apple Series
2 x Seagate Barracuda 7200RPM 1TB SATA 6Gb/s
The only thing I may need is a PSU, he has a Corsair VX 450W powering his Q6600, 560Ti, 4gig of ram, and 3 hard drives - would the 450W do for his new rig? I'm thiking it may be a little under powered, but then his new cpu will be less of a power drain, but there is twice as much ram in the new system.
I'm considering a new case too, but it has to be budget (preferably £60ish).
thanks for any advice
[edit] the spec above is about on my budget, so I'm really looking for advice on better alternatives / compatibility issues with ram and mobo etc, I'm very rusty on current tech

Already has a 560Ti and a case (though I'm tempted to get a better budget case).
Looking at purchasing:
i5-3570K oem
Cooler Master Hyper 212 Evo CPU Cooler
Gigabyte Z77X-UD3H Intel Z77
Kingston HyperX Genesis Grey 8GB (2x4GB)
Samsung 256GB SSD 830 Notebook/Apple Series
2 x Seagate Barracuda 7200RPM 1TB SATA 6Gb/s
The only thing I may need is a PSU, he has a Corsair VX 450W powering his Q6600, 560Ti, 4gig of ram, and 3 hard drives - would the 450W do for his new rig? I'm thiking it may be a little under powered, but then his new cpu will be less of a power drain, but there is twice as much ram in the new system.
I'm considering a new case too, but it has to be budget (preferably £60ish).
thanks for any advice

[edit] the spec above is about on my budget, so I'm really looking for advice on better alternatives / compatibility issues with ram and mobo etc, I'm very rusty on current tech