Ok so I bought my iMac in November really good one of my fav imac. But now I see that the new iMacs 21.5 i3 chips came out, I want to kno is it even worth upgrading my iMac to the i3? And how much of a difference will I notice if any, I use it for basic **** like surfing, dl games and movie shut like that, I just want to kno if I'll notice anything?