I would do some measuring to make sure everything fits...most items on newegg have sizes listed.
Take a look at this HSF...it's pretty good, and it should fit.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835186134
I would check the size of your rear fan (looks like a 80mm in there now), maybe get a 92mm to replace it...again, measure the mounting holes on the rear of your case to make sure it'll fit.
Take a look at this HSF...it's pretty good, and it should fit.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835186134
I would check the size of your rear fan (looks like a 80mm in there now), maybe get a 92mm to replace it...again, measure the mounting holes on the rear of your case to make sure it'll fit.