I reckon there were only a handful in the 2003-04 series, before they launched the Super, Mega and Monster Showcases for the remainder of the run (middle of 2004 to end of 2005). If it wasn't a car, it might've been the Waverunner, a Motorbike, or a Speed Boat... that was probably it! I know some holidays were valued over 10K, as was the Jukebox, as was the Spa... they're the only other five-figure items I can think of, off the top of my head, but I doubt they were ever offered as the grand prize in a showcase, and this is certainly the only one I remember where the Plasma was the most expensive item.