I'm not slamming the MBA here, and I'm actually impressed with the upgrade pricing on a few things. But what I'm unsure of is their cost to move from 128GB Model (1199) to the 256GB model (1499). Is that a fair upgrade price? Is there something I'm missing? - 1.8ghz i5 -> 2ghz i7 ($100) - 4GB -> 8GB ($100) - 128GB -> 256GB ($300) I really want that 256GB model but for $1500 it feels like it should've came with the 8GB included.