A budget and the part(s) you plan on keeping would help a lot to pick an upgrade.
I need only CPU + MotherBoard. The budget is an issue that's why I pointed Civ5 as criteria. I need CPU-Combo that will run the game at least at medium settings. If it's possible I want to go under the price of I5-3570(K) + sutiable MoBo. I think that Civ5 require less but I may be mistaken.