Here is what I have put together:
2x Corsair 2x4GB DDR3 Memory -
€79.80
EVGA GTX 670 -
€371.90
Intel Core i7 3770 -
€273.90
LG DVD/RW Drive -
€16.70
MSI Z77A-G43 -
€93.90
Samsung 1TB HDD -
€75.70
XFX 550W Power supply -
€56.90
Total = €968.80 that includes any kind of tax as far as I can tell
Cases you can choose from:
Corsair Midi Tower Obsidian 550D -
€114.90
Corsair Carbide 500R -
€98.60
Cooler Master Midi Tower CM 690 II Advanced -
€ 101.90
Fractal Design Midi Tower Define R3 -
€ 85.90
Corsair Midi Tower Carbide 300R -
€ 79.00
Cooler Master Midi Tower CM 690 II Advanced (different version) -
€ 73.90
Antec Midi Tower One Hundred -
€ 45.90
Sorry if you didn't know what IPS is. That has far better picture quality verse a TN monitor which mostly everyone has. I figured, since you are doing Photoshop this would benefit you. I have one and I notice the difference in games in terms of how crisp the image looks, PS2 especially.
Do you think that will benefit you? Otherwise you can get by with a cheaper TN panel. These do have a lower response also, but I don't think its going to make a major difference when it comes to even FPS gaming. If I had to choose the U2412 is a good option IMO.
In terms of overclocking you are looking at another €30 for the K version of the 3770 that allows you to OC plus another €20 to €40 for a proper cooler. Performance boost really depends on the game/program you are using. If it doesn't sound beneficial I wouldn't worry about it. That 3770 is a great little processor.
It does look like you may have the room for a SSD if you think that is worthwhile. Like this
256GB or
128GB SSD. The prices on these are dropping like crazy, so you may be better off just waiting for the larger capacities to get at a better pricing so you don't get stuck with a 128GB.