Currently have an i5 2300 at 3.4 ghz. My brother is going to microcenter soon to buy a 2500k, and I'm wondering if it would be worth it to upgrade. I don't know how much I could sell my 2300 for, but I'm thinking no more than a $50 upgrade. I also already have a hyper 212 cooler not being used atm so I'm thinking an overclock over 4.5ghz.