I have had a Dell PC or laptop for the past decade and I have yet to encounter any major issues. At worst a PSU went bad after 6 years of service.
No need to go W8 unless you are getting or plan to get a touch screen monitor.
Dell XPS 8300 | Intel i-5 2400 3.1Ghz | 750GB HDD & 1.5TB HDD | BD-RE | 6GB DDR3 RAM | GeForce GTX 760 | Corsair 750w PSU | Dell SP2309W 23" @ 2048×1152 | Logitech G500s
Nintendo Network ID: m1xm0d3