I suppose they could be considered similar; the 5000 series has a few less ports. I suspect your credit card company will probably give you up to the value of your TV, so you could check for something in the 8500 series if you'd like. It's the top of the line plasma.
My Samsung 50 inch plasma died not long after the warranty expired and fortunately I purchased it with a Mastercard which had 1 year extended warranty. I am allowed to replace the TV with a similar product.
Since Samsung no longer makes the PN50C6400 model (2010?) I tried to get something as close as possible. Would the 2013 Samsung PN51F5500AF be similar? And how would this TV be rated since Im a little nervous buying Samsung again.
Maybe a Samsung rep could chip in as well?