Reddit mentions of Radeon HD 7870 OC - GHz Edition

I'd suggest a better GPU and PSU.
I suggest this for a graphics card and this for a power supply. Also, that case comes with 4 fans, so you're good.

May I suggest:

http://www.amazon.co.uk/MSI-Z77MA-G45-Motherboard-Micro-ATX-Gigabite/dp/B007KZQF4S/ref=sr_1_4?ie=UTF8&qid=1368186198&sr=8-4&keywords=msi+z77

http://www.amazon.co.uk/Intel-I5-3470-Processor-3-20GHZ-Socket/dp/B0083U94CO/ref=sr_1_1?ie=UTF8&qid=1368186181&sr=8-1&keywords=core+i5+3470

https://www.4launch.nl/shop/winkelwagen/19504#p-4-productid-108240

http://www.amazon.co.uk/Corsair-8GB-XMS3-Memory-Module/dp/B008W6AK0O/ref=sr_1_2?s=computers&ie=UTF8&qid=1368186319&sr=1-2&keywords=8gb+ram+corsair

http://www.amazon.co.uk/Arctic-Alpine-11-Plus-Cooler/dp/B00606OHQQ/ref=sr_1_1?s=computers&ie=UTF8&qid=1368186340&sr=1-1&keywords=alpine+11+plus

http://www.amazon.co.uk/Western-Digital-internal-Hard-Drive/dp/B0088PUEPK/ref=sr_1_1?s=computers&ie=UTF8&qid=1368186360&sr=1-1&keywords=wd+blue+1tb

http://www.amazon.co.uk/Samsung-24x-SATA-DVD-Writer/dp/B0095MGUSU/ref=sr_1_6?s=computers&ie=UTF8&qid=1368186379&sr=1-6&keywords=samsung+dvd

http://www.amazon.co.uk/Fractal-Design-Core-Series-Micro/dp/B004ZH18G4/ref=sr_1_1?s=computers&ie=UTF8&qid=1368186475&sr=1-1&keywords=core+1000+usb3

http://www.amazon.co.uk/Arctic-Cooling-AFACO-09000-GBA01-F9-Fan/dp/B002KTZJOQ/ref=sr_1_1?s=computers&ie=UTF8&qid=1368186836&sr=1-1&keywords=arctic+cooling+F9

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graphics card:

http://www.amazon.co.uk/Sapphire-11199-19-20G-CrossFireX-Multi-GPU-Technology/dp/B00A1572FK/ref=sr_1_3?s=computers&ie=UTF8&qid=1368186514&sr=1-3&keywords=hd+7870

(OR)

http://www.amazon.co.uk/Zotac-GeForce-Edition-Graphics-Card/dp/B0095GU06O/ref=sr_1_5?s=computers&ie=UTF8&qid=1368186609&sr=1-5&keywords=GTX650Ti+2gb

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All products from Amazon has free shipping to the netherlands. You can overclock the CPU by raising the allowed TDP from 77W to 95W and raising turbo multipliers from (34-36) to (40,40,39,36). The cooler, I've added is quiet and can easily handle that small OC (but it's completely optional). Turbo multipliers can be raised by up to 4x with a locked CPU.

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EDIT:
Use this motherboard if you need to save another £20 / 25 Euro:

http://www.amazon.co.uk/Gigabyte-GA-B75M-D3H-SKT-1155-B75M-D3H-Motherboard/dp/B007R9CRGW/ref=sr_1_5?ie=UTF8&qid=1368187644&sr=8-5&keywords=b75+motherboard

You will not be able to overclock with that, though.

Reading up on some different reviews from different sites, this card looks neat. Would it be a good choice? It would also give me more money for a cooler and case

Don't forget about the monitor, keyboard and mouse. And speakers if the monitor doesn't have them and you want them.

I'm gonna agree with /u/H4rtland on the memory issue. Instead of 8Gb of DDR3-2133 RAM go with 16Gb of DDR3-1600 RAM. You won't notice the speed difference, I promise. I run lots of memory intensive simulations on my rigs and I haven't noticed much of a difference in the speed between the two. Having more memory is going to be more important to you than faster memory.

I'm not actually a fan of the GTX 660. Now the 660Ti is a nice one. For a budget such as yours, I would say that an AMD Radeon is going to be the better choice if you can get one. I feel that the AMD cards in that range are better than the Nvidia cards, but that's a personal opinion, I am not a fanboy of either by any means. Check out this AMD card.

I appreciate the advice but I already built this PC so I'll only be replacing the video card.

What makes that one better than this one? Is there really £45 worth of difference there?