i7-870 vs i5-2400

Im gonna buy a new PC but i dont know which one to buy 1. i want to get this one but if the second is better i will get that CPU: i7-870 RAM: 8GB DDR3 HDD: 250GB GPU: ASUS GTX 750 Ti OC 1072/1150MHz $206 2. CPU: i5-2400 RAM: 8GB DDR3 HDD: 320GB GPU: Gigabyte GTX 750 Ti OC 1033/1111MHz $206