I just can't decide on my new Mac. I've had my iBook 12inch G4 for about 5 years now and it's time to replace it with a new machine. The iBook is my only machine and I use it at work and at home. I'm an academic and my principal work uses are email, latex, keynote, pages, web browsing, and statistical computing in R and Python. My main personal/home use is web browsing, email, blogging, iPhoto and watching DVDs. Despite writing simulation programmes in Python, even for reasonably large datasets my iBook with 1GB RAM has been fine. The main reason for replacing it is the fact I'm now on my third HD, the battery lasts for about 20-30 mins and I'm fed up of the old OS. It's also quite heavy and runs hot. So my question is thus - would an MBA suit all my needs or should I get the MBP? My main concern is the lack of an optical drive for watching DVDs. Additionally I carry my laptop around quite a bit, sometimes working at home and office, as well as to different lecture halls and meetings. I'm also planning on getting an ACD for my office, which is where I spend most of my time and using that to connect my external HD to for back-ups. I don't think the lack of USB ports will be an issue therefore as the mouse/keyboard can be bluetooth. Both MBA and MPA can run a 24" ACD though right but neither can run the 30" - right? Anyway anybody using these laptops that could shed some light would be great.