Lost in the HDTV jungle

Hi im planing to build a home theater but instead of a projector im gonna use a HDTV.

Im gonna use the tv most to look at movies and series from a htpc(mediacenter). I dont look to much at sports so thats not so important. Im not gonna look so much at normal tv-consignment cuz, almost all tv-consignment in Sweden are in SD.

I did find a table in a computer magazine that showed TV"/distances so if ur couch are around 3-3,20m(witch my is) away from tv the u need at lest a 42" or bigger to see the full potential of full-hd material.

My budget is around 20000 Swedish kronor (around 2059,73€/2844,95$)

Anyone know if it is safe to use a plasma when taking the signal form a htpc. Or is the risk big that u get burn down images(dont know the english expression for this).

Now im looking on these two TV's:

Sony KDL52W4000

Pioneer PDP-508XD