Dell Studio XPS 435MT Power Supply Replacement

Vic 40

Titan
Ambassador
When i'm looking at the case is it an atx case and the corsair is an atx psu so it should fit.It has all the connectors you could wish for with a system like that so you're fine there also.

The next imo would already be good enough too if there is no powerhungry graphics card in that system,
http://pcpartpicker.com/part/corsair-power-supply-cx430
the 500watt will do fine too,but this one is a little bit cheaper and probably a little bit more efficient.