Originally Posted by AndyM95
No one can give you an answer, it's all up to you. If you're desperate for an upgrade get a 3570K but if you're willing to wait a few months then get Haswell
Hit the nail on the head there. The fact of the matter is there will always be something that is incrementally better just around the corner, or for a little more money. You really just have to decide what you want to do with your machine, how long you need it to work for you before an upgrade/replacement, and what your budget is. Take a look at what games/applications you are using today, and what you think you're likely to need/want to run in the future. It sounds to me like you just want a nice quad-core CPU to play with.
If you don't have a specific idea of what capabilities you are looking to build for then I would simply suggest keeping your budget under control. I agree that the D-14 is a great investment, since they will ship you an adapter kit for free (within the first 5 years of ownership) every time Intel decides to drop a new socket on us. Another thing to consider is that adding a second GPU or upgrading the one you have may give you more bang for your buck than the newest, fastest CPU. Consider a well cared for second hand 2500K and maybe trading up the GPU.
If you really just want to play with overclocking, then AMD may even be worth a look as the CPU you fry on that suicide 5.5ghz run will be affordable to replaceable. Their parts also seem to tolerate absurdly high voltages much better in my experience as well. Put simply, you need to decide what it is you are trying to accomplish first, and then build with that in mind. Always try to keep in mind that whatever you throw together now will be completely outdated in 4 or 5 years.
If the Ivy Bridge part accomplishes what you need to get done for the intended time frame, then there is no good reason to wait for Haswell. Two years or so after it comes out people will be talking about waiting for what comes next again. The upgrade cycle never ends. You just have to decide what you want your machine to offer, and be happy when you've nailed your specs at the lowest cost possible. It's nice to have some cash left for things like rent, food, and dating. My 2 cents.