Quote:
Originally Posted by enri95 
Ok , but I won't be able to sell my stuff for 250$ at that time in the future
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Most decent desktops, provided they are not Extreme Over Clocked, will last a very long time, it wouldn't make sense to Upgrade from a C2Q to an i5-750/760, when you could just use the money to get a better graphics card/PSU to prevent bottle necking if your gaming.
If your not planning on gaming, and you want the best chip for the money, i5-760 is a great deal, Hyper-Threading is not really needed unless your folding, or doing a massive amount of compression or CPU intensive task.
However, like those above you stated the difference between the C2Q and the i5 will be barely noticeable, however, if you add the overclocking factor, the difference is a little more substantial & definitely noticeable.
You have to look at your "Plan" with your CPU or System (overall build) and build based upon your intended needs & desires rather than just buying a board to Over Clock. If the Core 2 Quad isn't serving your needs, then upgrade, definitely, however, unless you need hyper threading, the i7's are overkill, the i5-760 would serve your purpose just fine.
First ask yourself: "Do I need to upgrade my CPU or my MB?" or "Do I need to upgrade my Graphics Card & PSU?"
I'll bet the answer lays with your GPU/PSU or Mother Board (In the case of OCing).