Assuming both use a SSD and no upgrade to the RAM, would the 2.5 GHz quad-core i7 or the 3.3 GHz quad-core i5 be faster? Not quite sure about the differences between the i5 and i7. Along those same lines, would it be worth the added 300€ to get the 4 GHz i7 over the 3.3 Ghz i5 if I went with the iMac (the more probable choice for me)?