The panny, their fullHD 1920x1080p plasma panels are not only stunning when reproducing HD sources, they still own the LCD panels when it comes to SD. Panny have excellent internal scalers. (Its also a smaller margin of error when scaling from 576line PAL SD to 1080, compared to 576 -> 768), 576 -> 1080 can "almost" be done simply with a line doubler(it would have 72 spare lines it would have to disgard).
Always worth checking the panel resolution too, if you upscale 576 line PAL to 720P, but have a 768 line TV, the TV's scalers will have to try to correct that. With the quality of Panny scalers feeding a raw SD feed, the TV will scale directly to the native panel resolution. With a 1080P set, if the DVD/Bluray/SkyHD box upscales to 1080 the TV's internal scalers are effectivly disabled, so you can choose which device has the best scaler, but on a 768line TV this is rarely if ever true, as you can only feed the screen with 480, 576, 720 or 1080 line feeds unless you use the VGA input.
Anyway, the Panny PZ range are all "TrueHD" 1920x1080. Stunning TV's for the price.