When is a good time to upgrade from a i5-2500? It seems currently that even a $300.00 processor is only about a 10% upgrade. Will the new Broadwell processors at the end of this year be a worthwhile upgrade? I definitely want a K this time so I can overclock. The reason I'm asking is because I want to run crossfire 7950's and my current motherboard only has a 4x slot so I am looking at new motherboards as well. Thanks.