A nice simple stable OS that like a DC-3 or a modal 1911 A colt 45 just keep doing what you need it to do with little overhead.
Take note the customers base seems to feel the same way as to this day it is the second most common computer OS in the US only being behind Window 7.
The next OS for me will be either a version of linux or perhaps ReactOS an open source clone version of XP.
ReactOS® is a free open source operating system based on the best design principles found in the Windows NT® architecture (Windows versions such as Windows XP, Windows 7, Windows Server 2012 are built on Windows NT architecture). Written completely from scratch, ReactOS is not a Linux based system, and shares none of the UNIX architecture.
The main goal of the ReactOS® project is to provide an operating system which is binary compatible with Windows. This will allow your Windows® applications and drivers to run as they would on your Windows system. Additionally, the look and feel of the Windows operating system is used, such that people accustomed to the familiar user interface of Windows® would find using ReactOS straightforward. The ultimate goal of ReactOS® is to allow you to use it as alternative to Windows® without the need to change software you are used to.
ReactOS 0.3.15 is still in alpha stage, meaning it is not feature-complete and is recommended only for evaluation and testing purposes.