I've been using a Macbook Air 13" i5 (Mid-2013) for school and I haven't had any problems with it. It's very light and portable, and I love it for that.
The only problem with it that you might run into is program compatibility. Just check online to see if your programs are availible for Mac/OSX. Also, check the system requirements while you're at it to make sure you can run everything the way you need to.
(Click here for specs)
(I know my Intel Core i5 is a bit underpowered on paper; however I haven't had any problems with it at all while using the computer; I was even able to edit/render HD video with the in-built GPU [Intel HD 5000 1024MB] with no issues at all.)
Just check to see if your programs are availible for Mac/OSX and also check for any programs you might need in the future. Also, keep hard disk capacity in mind. If your programs or file plans take up a lot of disk space, the standard Mac Air 128 GB SSD may not be enough for you. You can opt to have 256GB or even 512GB but it will cost you a pretty penny.
Apple is very good about customer support. I had a friend whose 2007 Macbook Pro gave out for reasons unknown and they upgraded him to a new 2012 Macbook Pro for free; they even recovered his files from the hard disk and transferred them to the new laptop.
(I'm not sure if this is true, but I've heard that Apple Customer Support keeps logs on you for things like how nice you are and that sorta thing. True or not, be sure sure to be pleasant and polite if you ever need to call them
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Happy Laptop Hunting!