Worst for me would have to be 7800GT. I had three cards failing within a few months. The one I liked the most was my GF4 ti4200 that I had for awhile between my 9600pro being broken and my purchase of 9800pro. It didn't cost me much since it was fairly old when I got it, but it performed about as well in most games as the 9600pro I had earlier, it overclocked like crazy and still didn't become very warm and best of all it never failed me. It's the only card I've had with no issues what so ever with drivers, crashes or anything.