I have the 64" Samsung 7000 and it was a great purchase for me. A replacement for a 60" Pioneer so I was prepared to be disappointed, but I simply have not been. The Samsung basically got higher marks than the GT series for color accuracy and generally identical everything else. I've always put it on a decent power conditioner and I've never experienced 'buzz' that others have had issues with, so it may be necessary to feed it a very clean power source for best results, but I've been very happy.
I love Panasonic as well, but don't consider it much of a huge difference between Samsung and Panny in terms of image quality differences. The VT series is nicer, but not the same price class as the 7000 series was in.