Processor slot type: 1155Motherboard slot type: 1156I'm not sure if they are compatible, but I'd look that up to be safe.
Yeah, those definitely aren't compatible. No real reason to go the K series especially if this is your first buildGo with the 2400 instead of the 2500. There is not real performance increase between the two. http://www.newegg.com/Product/Product.aspx?Item=N82E16819115074
I didn't see that budget part... If your budget is only $600 you shouldn't be investing in a sandy-bridge processor. If you bought one you would only have $300 to spend on the other components which leave the rest of them pretty stuffty.