pps, for those not quite following my argument of Geths' CPU, quad core CPU's are about 6 years old already, the i5 is nothing more than a quad core CPU with some slightly faster clock speeds a bit of optimisation from a processing perspective. This reminds me very much of the the Pentium D series versus the core 2 duo's, the core2duos also had a bit of a better optimisation to the CPU and higher clock speeds but the quad cores, with their slower clocks but more cores was the winner then and more cores will again be the winner this time round.
The future is more and more cores and game developers are writing their code accordingly. Having an 8 core (even if it is not real 8 cores) will still give you longer longevity than a simple quad core with higher clock speeds will give you. That argument about what is the fastest, a ferrari or a mini bus taxi has reference. For those that haven't read the whole article, most people will claim a ferrari is the fastest but if you need to transport 20 people, then the mini bus is the faster option. (people = bandwith, car speed = CPU frequency).
Anyevent, good luck with your choice and as mentioned, feel free to shop around. I have noticed that Frontosa is no longer as competitive on GPU's as they used to be.