the standard answer from most pc builders will be to get rid of the standard PSU and get one from a respectable manufacturer. 500W will be more than enough. you could run your rig on an antec earthwatts 380W PSU if you wanted. If you want to overclock, it will still be enough. trust me. i've done the research, i've asked the questions, i've tested the systems myself.
Sorry maybe it will work now. Thank you for the quick response . Will I need to change anything in the case such as liquid cooling to overclock or will what I have be fine?
yup take that sucker out, put the antec in there and you're golden. And as far as OC preparation goes, IMO, "liquid cooling" kits are just expensive ways to get a slightly less loud OC'd rig. it won't provide better cooling than a hyper 212 evo would, but it costs 2-3 times as much.