Suggestion for a laptop or desktop.

@pri4321 Solid State Drives. They have a faster reading speed compare to traditional hard drives. It does improve the loading time of the game too. 250-250GB should be enough for Sims 3 and Operating System combined.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820721108

PSU Wattage really depends on how much power is needed each pc components need such as CPU and GPU. Sorry if I'm making stuff even more confusing. I get nerdy when comes to PC stuff :p