Which PSU

[PC-M Vip3r]

I am getting the BFG GeForce GS OC 256MB GDDR3 card soon. But I have realised a flaw. I currently have a cheapo 450W PSU and wondered if the new GFX card will sap too much power. So bassically I was wondering what I should do. Rest of PC specs are below.

TIA

 

[PC-M Vip3r]

Thanks for the quick reply. I have heard good stuff about the Enermax and the Targan, so i'll go with them. Are you sure that 400W will be enough? I want to OC my Processor a bit more.

Edit: I forgot to mention that I would want one that power cables not in use can be removed by unplugging them. and I have a AXT Case.