they might be true quad cores but the actual difference is negligible, comparison
If he's got the money might as well get the quad. If he wanted to save a bit then the i3 would make more sense than the i5 650 considering the i3 overclocks a fair bit on the stock cooler.
no but I included an after market cooler and antec P series case = quieter system
And its not just £9 more, cos youve also got the cost of gfx card to account for, so its £50 more