Just to answer your question. For 17 euros, not much difference.
But my recommendation, since you will be rendering and editing, is to go with a 4-core with Hyper-Threading Technology (making the 4 core perform on 8 threads). All i5's do not have HTT, so that's the disadvantage and I feel you won't get your money's worth. Get the i7, or if you are on a very tight budget, the Xeon.
Additional info: you also want to have your RAM as 16GB (2x8GB) for your work.