Well im not sure if you need a new power supply take away the gpu that you re buying from the psu calculator and that will probably make a difference.

Also they vary in prices because some are a lot less reputable (q-tec have a bad rep). Look for Hiper, OCZ, Thermaltake, Antec, OCZ, Enermax, Seasonic. Your better off spending quite a bit on a power supply because they can ruin every component in your system if they break sometimes so don't go for an el cheapo!

You probably need an ATX power supply do you know what form factor the motherboard is or the current power supply look on the power supply label for something like AT, ATX.

it doesn't say anything, can you tell by the model of the power supply?

Yes if you can find some information. Im a bit busy atm but will have a look when im not.

Can't really find anything, sorry, but I'm pretty sure that it is ATX, don't know why but that's the 1 I'm leaning on.

i would have thought it is ATX. Most of them are nowadays. I cant find any more info either not even on delta electronics website.

So I should go with one of the popular brands with around 500w-600w power? Are all the Power Supplies the same size (meaning, do they all fit inside the case perfectly)? Do the Main Connectors play a big role(20 pin, 20+4 pin)? Does the version matter (ATX v1.02, v2.2)? Are all Volts good(100 - 240 V, 115-120V)? Does it matter a lot if it doesn't support Modular Cabling? Are these any good brands (FSP Group (Fortron Source), SPARKLE, ENERMAX, Silverstone)? Some website was recomending them.

Yep i would go for 500w - 600w probably but towards 600w would probably be a bit over the top. Generally they fit in all cases although not necessarily so just check the specs for dimensions.

Im not sure about the volts and connectors completely so i will get someone else to reply.