Hi, I've recently started to think that I should get a 13" MBA with a TBD instead of an iMac. I could really use the portability in the house even if I already have an iPad. My main use is web, mail, and iPhoto. No heavy photoshopping or movie making, maybe some basic home video editing in iMovie. In addition, I do use quite some big PowerPoint presentations (sometimes 100+ slides) and big MS Excel files with a few macros at work. I tend to work on those on my home computer in the week evenings. Will the 13" MBA handle this with ease or do I need something else. No particular budget constraints soi can max it out if need be. Thanks in advance.