My old laptop could play it using an i5 430m and GT 230m. In fact I had it running on an even older machine at one point (but not on high settings) Northwood P4 Single core w/HT and some intel G845 intergrated GPU haha.
If you want a build with today's parts, look at this. With this you'll be able to mod and still get decent frames.
PyjamasCat, that is too small capacity PSU for a build like that. He should get at least 8GB RAM also. Other parts looked really good. Boijay: get a better power supply unit if u can! Then go for it! It looks good to me at least.