psu how much £?

[dave00]

i am buying a new pci-e graphics card and my pc only came with a 300w psu
and the card i need says to have a 450w psu are they expensive cause ive seen ones that are £20-£30 and some like £70 will a cheaper one do cause im on a really tight budget

 

[dave00]

ATX 500W MAGNA SILVER & CLEAR PSU plus is this no good either?

 

[dave00]

tell me what u think of these ones
EYE-T 550 SWITCHING PSU £32
ATX-550W AMD/ P4
* Fan Speed Adjustable
* 12cm Fans
* Ultra Silent
* High Teach Aluminum
* Max Cooling
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EZCool 600w 12cm Silver Quiet PSU+SATA £35
# Compatible for Intel P4 and AMD/ XP , meets Intel v.2.03- Enhanced +12V for PIV
# 2 x 80mm Ball bearing fan and noise killer for quiet PC exhausts larger volume of hot air
# 230V, rear power on/off, power down
# Over voltage and circuit protection +3.3v,+12V,+12V
# 100% burn in and Hi pot tested CE/TUV/FCC/UL approval
# Built in EMI filter on power outlet
# Sealed Retail boxed with instructions
# Smart fan control and Green power design
# Super Silent rated at 23dBa