Tough choice. You want to buy one of the new MacBook Air's? Good, so you have already made your decision. But some agonizing questions remain: i5 CPU or the more powerful i7 chip? 128 GB SSD or even the 256 GB drive? Our review should give you some assistance.
http://www.notebookcheck.net/Review-Apple-MacBook-Air-11-inch-Mid-2013-1-7-GHz-256-GB-Subnotebook.97445.0.html