I have 2 Dell computers, a laptop w/XP which has performed just fine for the limited use it gets. My desktop is an XPS/One running Vista Ultimate and it has been a night mare! In just under 3 years, I've had the motherboard and hard drive replaced twice each!! Next time it goes down it is going out the window! I sell online so am on the desktop 15 - 18 hours a day, so it does get a lot of use but I don't play games or really watch much video on it. It has the media center, but I don't use it much either. I do have tons of photos though!
My iPad is my first Apple device and I am a convert! My son has always been a Mac guy and my daughter just switched. I never thought I'd switch until I got my ipad! My next computer purchase will be a Mac. I am really low tech so I hope I can find someone to help me when that time comes!!