i5 4440 vs i5 3470 vs i5 3570

Okay, the 3470 has the middle frequency but had poor integrated graphics. The 3570 can reach a much higher frequency but also relies on Intel HD 2500. The 4440 can reach 3.30Ghz, which is lower than the others, but has Intel HD Graphics 4600, so I recommend that, unless of course you will have an external graphics processing unit.
 
^Adding to logainofhades, 4440 is easily a more power efficient and well balanced processor. Even if you think that the 3rd gens have more clock speed, this one gives a superior Integrated Graphics. This adds to its overall performance. Moreover, its a bit cheaper than 3570 too! A good CPU there :)