The arctic freezer should be good for a dual core: http://www.ebuyer.com/product/105994
I don't know much about those screens. Everything you do on your PC is on your screen so it makes a big difference to everything and most keep the same screen for years, so get the best screen you can even if it means sacrificing other areas. If I was you I would maybe try to stretch to this: http://www.ebuyer.com/product/142909