Forget Dell ( DELL), H-P ( HPQ) and Apple ( AAPL), right now the leader in business computing is Salt Lake City-based Xi3. Why? The Xi3 breaks the office computer down into modular components that can be customized, fixed and, yes, even upgraded. So not only are you able to target the exact components you need; you are able to swap them out as your needs change. It's brilliant. And it means the Xi3 could be the last PC you ever buy. Now, the concept has issues. They are not cheap to buy, and to use them properly real techno savvy is required. But consider that one of these things -- monitor excluded -- is smaller than a Coke can, is made of solid metal and can be configured to handle everything from a single seat to massive groups of enterprise users. Assuming you know even a little about business computers, the Xi3 is the PC idea of the moment.