Because of my budget I have basically two options to go with, I already have the graphics card so that i cannot change that but my budget is roughly $800 (£500) amazon UK would be easiest place to buy
AMD Build:
case:
http://www.amazon.co.uk/CiT-Vantage-Gaming-Audio-Reader/dp/B0071KZNUY/ref=sr_1_2?s=computers&ie=UTF8&qid=1336826527&sr=1-2
= £31
CPU:
http://www.amazon.co.uk/AMD-FX-Series-FX-8120-Processor-Warranty/dp/B005UBNKZG/ref=sr_1_1?s=computers&ie=UTF8&qid=1336513429&sr=1-1
=£123
Motherboard:
http://www.amazon.co.uk/Asus-SABERTOOTH-990FX-ASUS-AM3/dp/B0053GR2HA/ref=pd_bxgy_computers_img_b
=£114
Hardrive:
http://www.amazon.co.uk/Samsung-HD103SJ-internal-SATAII-7200RPM/dp/B002MQC0P8/ref=sr_1_1?s=computers&ie=UTF8&qid=1332774339&sr=1-1
=£85
Ram:
http://www.amazon.co.uk/Corsair-CMZ8GX3M2A1600C9-1600MHz-Vengeance-Memory/dp/B004CRSM4I/ref=sr_1_2?s=computers&ie=UTF8&qid=1336827266&sr=1-2
=£40
CD Drive
http://www.amazon.co.uk/Sony-AD-7261S-0B-Internal-DVDRWRAM-Lightscribe/dp/B003SM3HH0/ref=sr_1_1?s=computers&ie=UTF8&qid=1332777148&sr=1-1
=£15.99
Power supply:
http://www.amazon.co.uk/OCZ-OCZ600MXSP-UK-ModXStream-Power-Supply/dp/B001GLFD54/ref=sr_1_5?s=computers&ie=UTF8&qid=1336855473&sr=1-5
=£50
Cooling fan:
http://www.amazon.co.uk/Arctic-Cooling-Freezer-Xtreme-Cooler/dp/B001X017G2/ref=sr_1_2?ie=UTF8&qid=1336830046&sr=8-2
=£28
Intel Build:
case:
http://www.amazon.co.uk/CiT-Vantage-Gaming-Audio-Reader/dp/B0071KZNUY/ref=sr_1_2?s=computers&ie=UTF8&qid=1336826527&sr=1-2
= £31
CPU:
http://www.amazon.co.uk/gp/product/B007RUZKK6/ref=s9_simh_gw_p147_d0_g147_i2?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-2&pf_rd_r=1B9R2WAZ08Y1WYFCCY02&pf_rd_t=101&pf_rd_p=467128533&pf_rd_i=468294
=£188
Motherboard:
http://www.amazon.co.uk/Asus-P8Z68-V-LX-Motherboard-LucidLogix/dp/B005FSHIVG/ref=pd_bxgy_computers_img_c
=£88.04
Hardrive:
http://www.amazon.co.uk/Samsung-HD103SJ-internal-SATAII-7200RPM/dp/B002MQC0P8/ref=sr_1_1?s=computers&ie=UTF8&qid=1332774339&sr=1-1
=£85
Ram:
http://www.amazon.co.uk/Corsair-CMZ8GX3M2A1600C9-1600MHz-Vengeance-Memory/dp/B004CRSM4I/ref=sr_1_2?s=computers&ie=UTF8&qid=1336827266&sr=1-2
=£40
CD Drive
http://www.amazon.co.uk/Sony-AD-7261S-0B-Internal-DVDRWRAM-Lightscribe/dp/B003SM3HH0/ref=sr_1_1?s=computers&ie=UTF8&qid=1332777148&sr=1-1
=£15.99
Power supply:
http://www.amazon.co.uk/OCZ-OCZ600MXSP-UK-ModXStream-Power-Supply/dp/B001GLFD54/ref=sr_1_5?s=computers&ie=UTF8&qid=1336855473&sr=1-5
=£50
Cooling fan:
http://www.amazon.co.uk/Arctic-Cooling-Freezer-Xtreme-Cooler/dp/B001X017G2/ref=sr_1_2?ie=UTF8&qid=1336830046&sr=8-2
=£28
AMD Build:
case:
http://www.amazon.co.uk/CiT-Vantage-Gaming-Audio-Reader/dp/B0071KZNUY/ref=sr_1_2?s=computers&ie=UTF8&qid=1336826527&sr=1-2
= £31
CPU:
http://www.amazon.co.uk/AMD-FX-Series-FX-8120-Processor-Warranty/dp/B005UBNKZG/ref=sr_1_1?s=computers&ie=UTF8&qid=1336513429&sr=1-1
=£123
Motherboard:
http://www.amazon.co.uk/Asus-SABERTOOTH-990FX-ASUS-AM3/dp/B0053GR2HA/ref=pd_bxgy_computers_img_b
=£114
Hardrive:
http://www.amazon.co.uk/Samsung-HD103SJ-internal-SATAII-7200RPM/dp/B002MQC0P8/ref=sr_1_1?s=computers&ie=UTF8&qid=1332774339&sr=1-1
=£85
Ram:
http://www.amazon.co.uk/Corsair-CMZ8GX3M2A1600C9-1600MHz-Vengeance-Memory/dp/B004CRSM4I/ref=sr_1_2?s=computers&ie=UTF8&qid=1336827266&sr=1-2
=£40
CD Drive
http://www.amazon.co.uk/Sony-AD-7261S-0B-Internal-DVDRWRAM-Lightscribe/dp/B003SM3HH0/ref=sr_1_1?s=computers&ie=UTF8&qid=1332777148&sr=1-1
=£15.99
Power supply:
http://www.amazon.co.uk/OCZ-OCZ600MXSP-UK-ModXStream-Power-Supply/dp/B001GLFD54/ref=sr_1_5?s=computers&ie=UTF8&qid=1336855473&sr=1-5
=£50
Cooling fan:
http://www.amazon.co.uk/Arctic-Cooling-Freezer-Xtreme-Cooler/dp/B001X017G2/ref=sr_1_2?ie=UTF8&qid=1336830046&sr=8-2
=£28
Intel Build:
case:
http://www.amazon.co.uk/CiT-Vantage-Gaming-Audio-Reader/dp/B0071KZNUY/ref=sr_1_2?s=computers&ie=UTF8&qid=1336826527&sr=1-2
= £31
CPU:
http://www.amazon.co.uk/gp/product/B007RUZKK6/ref=s9_simh_gw_p147_d0_g147_i2?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-2&pf_rd_r=1B9R2WAZ08Y1WYFCCY02&pf_rd_t=101&pf_rd_p=467128533&pf_rd_i=468294
=£188
Motherboard:
http://www.amazon.co.uk/Asus-P8Z68-V-LX-Motherboard-LucidLogix/dp/B005FSHIVG/ref=pd_bxgy_computers_img_c
=£88.04
Hardrive:
http://www.amazon.co.uk/Samsung-HD103SJ-internal-SATAII-7200RPM/dp/B002MQC0P8/ref=sr_1_1?s=computers&ie=UTF8&qid=1332774339&sr=1-1
=£85
Ram:
http://www.amazon.co.uk/Corsair-CMZ8GX3M2A1600C9-1600MHz-Vengeance-Memory/dp/B004CRSM4I/ref=sr_1_2?s=computers&ie=UTF8&qid=1336827266&sr=1-2
=£40
CD Drive
http://www.amazon.co.uk/Sony-AD-7261S-0B-Internal-DVDRWRAM-Lightscribe/dp/B003SM3HH0/ref=sr_1_1?s=computers&ie=UTF8&qid=1332777148&sr=1-1
=£15.99
Power supply:
http://www.amazon.co.uk/OCZ-OCZ600MXSP-UK-ModXStream-Power-Supply/dp/B001GLFD54/ref=sr_1_5?s=computers&ie=UTF8&qid=1336855473&sr=1-5
=£50
Cooling fan:
http://www.amazon.co.uk/Arctic-Cooling-Freezer-Xtreme-Cooler/dp/B001X017G2/ref=sr_1_2?ie=UTF8&qid=1336830046&sr=8-2
=£28