TopicClocker is correct. I have bought my CPU at Microcenter. In fact, I've never bought new anywhere else. They're return policy says 15 days on CPU's but I've brought them back on day 30 without hassle.
I have used nearly every CPU from Sandy Bridge on and Phenom II on. I have also used most GPU's from 2011 on, from low, mid and high. I've built 100's of rigs over the years. Most for fun and some for side work. If you have any questions and want an unbiased opinion, please feel free to PM me.