Ok, I want to upgrade my current pc into one that is suitable for gaming. I've got an idea on the parts but any comments & help would be great. 
I don't want to spend much more than £500 on it (I'm from the UK) & as I said I want it to be decent for gaming.
PARTS NOT REQUIRED: PSU - I'll be reusing an Antec Earthwatts 500w that I have; keyboard; mouse; monitor; speakers; OS.
MONITOR RESOLUTION: 1680x1050
Current List:
CPU, MOBO & RAM Bundle:Core i3 530, Biostar TH55B & 4GB DDR3 1333MHz RAM Bundle Deal £248.99
Case:Antec 300 Three Hundred, Black Midi Tower Ultimate Gaming Case w/o PSU £43.45
Graphics Card:1GB XFX HD 5770, AVP Edition PCI-E 2.1, 4800MHz GDDR5, GPU 850MHz, 800 Cores, DP/ DVI/ HDMI £127.83
Hard Drive:500GB Samsung HD502HJ Spinpoint F3, SATA 3Gb/s, 7200rpm, 16MB Cache, 8.9 ms, NCQ, OEM £40.35
Disk Drive:LiteOn IHAS324-32 24x DVD±R, 8x DVD±DL, DVD+RW x8/-RW x6, DVD-RAM x12, SATA, Black, Retail £20.55
Heat Sink Fan:Coolermaster Hyper 212 Plus, 4 Heat Pipes, LGA775/1156/1366/AM2/AM2+/AM3 £19.95
£248.99
£43.45
£127.83
£40.35
£20.55
£19.95
-------------
£501.12
As I said before any help would be great.
EDIT:
2nd build with more reliable RAM & a slightly better motherboard but no Hyper 212 Heat Sink Fan:
CPU:Intel Core i3 530 Dual Core Clarkdale 32nm, 2.93GHz, 4MB Cache, 73W, Integrated GPU @ 733MHz, Retail £92.98
MOBO:Gigabyte GA-P55M-UD2, Intel P55 Express, S1156, DDR3 2200, SATA 3Gb/s, SATA RAID, uATX £87.60
RAM:4GB (2x2GB) Corsair DDR3 PC3-10666 (1333) Non-ECC Unbuffered, CAS 9-9-9-24, 1.50V £94.12
Case:Antec 300 Three Hundred, Black Midi Tower Ultimate Gaming Case w/o PSU £43.45
Graphics Card:1GB XFX HD 5770, AVP Edition PCI-E 2.1, 4800MHz GDDR5, GPU 850MHz, 800 Cores, DP/ DVI/ HDMI £127.83
Hard Drive:500GB Samsung HD502HJ Spinpoint F3, SATA 3Gb/s, 7200rpm, 16MB Cache, 8.9 ms, NCQ, OEM £40.35
Disk Drive:LiteOn IHAS324-32 24x DVD±R, 8x DVD±DL, DVD+RW x8/-RW x6, DVD-RAM x12, SATA, Black, Retail £20.55
£92.98
£87.60
£94.12
£43.45
£127.83
£40.35
£20.55
---------------
£506.88
Which one do you guys think is the better build?
P.S. Is it any issure having a miniATX board when I could probably fit a full ATX? What are the disadvantages?
I don't want to spend much more than £500 on it (I'm from the UK) & as I said I want it to be decent for gaming.
PARTS NOT REQUIRED: PSU - I'll be reusing an Antec Earthwatts 500w that I have; keyboard; mouse; monitor; speakers; OS.
MONITOR RESOLUTION: 1680x1050
Current List:
CPU, MOBO & RAM Bundle:Core i3 530, Biostar TH55B & 4GB DDR3 1333MHz RAM Bundle Deal £248.99
Case:Antec 300 Three Hundred, Black Midi Tower Ultimate Gaming Case w/o PSU £43.45
Graphics Card:1GB XFX HD 5770, AVP Edition PCI-E 2.1, 4800MHz GDDR5, GPU 850MHz, 800 Cores, DP/ DVI/ HDMI £127.83
Hard Drive:500GB Samsung HD502HJ Spinpoint F3, SATA 3Gb/s, 7200rpm, 16MB Cache, 8.9 ms, NCQ, OEM £40.35
Disk Drive:LiteOn IHAS324-32 24x DVD±R, 8x DVD±DL, DVD+RW x8/-RW x6, DVD-RAM x12, SATA, Black, Retail £20.55
Heat Sink Fan:Coolermaster Hyper 212 Plus, 4 Heat Pipes, LGA775/1156/1366/AM2/AM2+/AM3 £19.95
£248.99
£43.45
£127.83
£40.35
£20.55
£19.95
-------------
£501.12
As I said before any help would be great.
EDIT:
2nd build with more reliable RAM & a slightly better motherboard but no Hyper 212 Heat Sink Fan:
CPU:Intel Core i3 530 Dual Core Clarkdale 32nm, 2.93GHz, 4MB Cache, 73W, Integrated GPU @ 733MHz, Retail £92.98
MOBO:Gigabyte GA-P55M-UD2, Intel P55 Express, S1156, DDR3 2200, SATA 3Gb/s, SATA RAID, uATX £87.60
RAM:4GB (2x2GB) Corsair DDR3 PC3-10666 (1333) Non-ECC Unbuffered, CAS 9-9-9-24, 1.50V £94.12
Case:Antec 300 Three Hundred, Black Midi Tower Ultimate Gaming Case w/o PSU £43.45
Graphics Card:1GB XFX HD 5770, AVP Edition PCI-E 2.1, 4800MHz GDDR5, GPU 850MHz, 800 Cores, DP/ DVI/ HDMI £127.83
Hard Drive:500GB Samsung HD502HJ Spinpoint F3, SATA 3Gb/s, 7200rpm, 16MB Cache, 8.9 ms, NCQ, OEM £40.35
Disk Drive:LiteOn IHAS324-32 24x DVD±R, 8x DVD±DL, DVD+RW x8/-RW x6, DVD-RAM x12, SATA, Black, Retail £20.55
£92.98
£87.60
£94.12
£43.45
£127.83
£40.35
£20.55
---------------
£506.88
Which one do you guys think is the better build?
P.S. Is it any issure having a miniATX board when I could probably fit a full ATX? What are the disadvantages?
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