Well my friend you have a lot of options.
Im going to list the highest of highest componants that you can buy for 1500 pounds.....
CPU - Not that the FX series isnt cool and all but in the truth of the matter they dont out perform the 4000+ by that much in most applications so I really dont see the need to spend $400-800 more for one.
AMD Athlon 64 4000+, 2.4 GHz, 1MB L2 Cache Socket 939
http://www.newegg.com/OldVersion/ap...tion=19-103-529&catalog=23&manufactory=BROWSE
Motherboard - MSI "K8N Neo4 Platinum SLI" NVIDIA nForce4 SLI Chipset Motherboard
http://www.newegg.com/OldVersion/ap...tion=13-130-487&catalog=23&manufactory=BROWSE
Memory - Corsair Dual Channel XMS 184-Pin 2GB(2x1GB) DDR PC-3200
http://www.newegg.com/OldVersion/ap...tion=20-145-575&catalog=23&manufactory=BROWSE
Video - MSI nVIDIA GeForce 7800 GTX Video Card, 256MB GDDR3, 256-Bit, S-Video/ Dual DVI,PCI-E
http://www.newegg.com/OldVersion/ap...tion=14-127-182&catalog=23&manufactory=BROWSE
PSU- SILVERSTONE Zeus 650W Power AWSOME AWESOME PSU this PSU is no doubt the best for the money So reviews and see. Just baught one and OMG it rocks......
http://www.newegg.com/OldVersion/ap...tion=17-163-108&catalog=23&manufactory=BROWSE
Hard Drives- 2 of these bad boys in Raid 0 - Western Digital Raptor 74GB 10,000RPM SATA Hard Drive
http://www.newegg.com/OldVersion/ap...tion=22-144-160&catalog=23&manufactory=BROWSE
and one of these for your large media and backup files if you need it... Western Digital 320GB 7200RPM SATA Hard Drive, MODEL WD3200JD
http://www.newegg.com/OldVersion/ap...tion=22-144-394&catalog=23&manufactory=BROWSE
Sound - If you desire go with a PCI based sound card....Onboard sound is great and handy but it does draw away from CPU performance in games some say - but I have not ever noticed so I leave this as optional equipment.
Creative Labs Sound Blaster Audigy2 ZS GAMER Limited Edition PCI Sound Card
http://www.newegg.com/OldVersion/ap...tion=29-102-171&catalog=23&manufactory=BROWSE
Case - Last but not least and of course your opion and own personal style will prevail over my taiste overall and you will probably not pic this case but I am just showing you as an example as what you should be going with in terms of cooling and case functuality.
Lian-Li Black Aluminum Case with Side Panel Window & 1 Ball-Bearing Fan on the Top, Model PC-65B
http://www.newegg.com/OldVersion/ap...tion=11-112-040&catalog=23&manufactory=BROWSE
Just to show you what this baby looks like jammed pack with componants and how it still looks presentable instead of wire mayhem here is a link to Lian-Li PC-65B.
https://www.techspot.com/gallery/showphoto.php/photo/589/cat/500/page/1
Your not going to find a case with better wire managment and storage space in a mid-tower without going 2 a full -- Does it look like I have 5 hard drives in there ?
For all of that I have listed it runs about $2500us 1440 pounds
Of course you will have to find a Euro shop with newegg.coms awesome prices..
With that you will exceed most of the gaming world......