The base 13" MBP and base 13" MBA are the same price. Upgrading the MBP to a 128 SSD is about $70 extra (at least that's what I paid for a Samsung 830 128 GB SSD a month or so ago). So at that point, an extra $70 gets you the same 4GB RAM, same 128 GB SSD, same HD 4000 graphics, same footprint, and same advertised battery life. The differences with the MBP, are: * 8% faster processor (per Geekbench scores, even though you'd think 39% faster from 1.8 to 2.5) * an extra 1.5 lb (+50%) in weight and thicker machine compared to the MBA * lower resolution high glare screen (with better color depth though) * integrated SuperDrive * ethernet port * firewire port * further upgradeability of RAM and SSD (this is probably the most important differentiator) I think it just depends if you like it thin, light, and fast with a higher-res screen (MBA) but locked in to the configuration you buy vs the MBP trade-offs I listed above. Thanks!