I am looking for advice on buying a new computer. I am currently a technical writer, but I am enrolled in masters degree program for math teaching. I have a Dell laptop that I use from work, and a slowly dying Insignia desktop for personal use. When I bought the desktop two years ago, I spent about $500 because all I needed it for was email, the internet, and the basics. Now I am considering buying a machine that can handle Mathematica and LaTeX, and eventually I'm hoping to work with Adobe InDesign or a similar package. I plan to continue to use my writing skills while developing my math and programming knowledge. I like the work of Edward Tufte and may try to learn some of his techniques. I am just looking for a starting point. I don't know whether to lean towards a desktop or laptop. Many people (including Tufte) have suggested that I buy a Mac. I don't have a budget for the new machine yet, so I'd like to know what I should consider and what it may cost.