my iBook turns two

A few days ago made 2 years that I've had my iBook (14" G4 1.33 ghz). I can't imagine ever going back to the headaches of the PC world. It has served me very well, and I've helped convince at least four people to switch. I have my eye on some of the new macs--they're almost twice as fast--and wonder about when to upgrade. I don't know if my next Mac will be a MacBook or a Mac Mini. One thing to think about is that I'll be doing field work in Latin America in two years so I'll want a laptop but it might be nice to have it not be a brand new one as far as getting stolen, etc. So perhaps a Mini as my new primary computer 6 months to a year from now with the iBook for travel will make sense. To help fight the urge to always have the newest thing (in addition to the monetary cost) I remind myself how much water computer chips pollute--so it's good to wait as long as possible before getting a new computer. Really the iBook is doing great for everything I need it for, so I may wait longer than that. It's interesting how some people upgrade every year or year and a half and others wait 5-6 years.