Looking for a reality check here guys and gals.... 13" MBA is the topic, i5 4GB/128GB should be fine for my needs. iMovie / Apeture / parallels BUT.... I cant help but wonder how much better the 1.8Ghz i7 would be. Is this the snob in me wanting the best available, or is the processing power vastly superior. Although geekbench is showing a performance difference, i have yet to see anyone use a Mac in the same way that Geekbench measures its stats. There is a piece of me trying to justify the larger SSD and upgrade the 13" base to 256GB and then it is a fairly short hop to the i7. It is working out about £300 difference between base model 13" and ultimate. Please help me put my mind at ease...... It's not easy getting buyers remorse BEFORE the purchase..!