Hi Quick question, Im going to buy the 13 rMBP but some reviews I have read say that it lags a bit when browsing multiple image heavy web sites. If this is so, will paying the extra for the i7 upgrade help? Im using the education discount so even though its still an obscene price Im getting the base i5 for £1245 or the i7 upgrade for £1383. I know the 15 is close to the price but Im set on 13 laptop. The only other option is the Air but I see the retina screen being more future proof. Thanks, any thoughts?