I would get an LED, they use way less energy
, jk...
I think 9 years of technology should give you a better picture even with the larger display...
One of my employees just bought a 60" LG plasma, it is definitely a nice picture, his was on sale for $900, {I know because I let him borrow truck to go pick it up and my credit card to pay for it, then I had to go help mont it because they couldnt find a stud, they were useing a 1/2" nail to find a stud, I wish I took a picture of all the tiny holes in the plaster above the baseboard, they checked every 1/4" for about 4 feet...!!! you may be able to see why he only make s$15.50 per hour lol, actually a really good kid though...}
ANYWAY, go for the new tv, sell your while its still worth something, after almost a decade it doesnt owe you anything that is for sure...