Firstly, thanks guys for all your help in making my purchase of a new MacBook pro so simple! Now I'm moving on to my home machine- a iMac. At home I would consider myself a 'light' user. Usual stuff- watch videos, surfing, have a lot of music etc.. I am upgrading a 21" Late 2013 iMac. Real estate- 21" is still the best size for me. 1st question-3.0GHz quad-core 7th-generation Intel or 3.4GHz quad-core 7th-generation Intel??