The definitive HDTV buyer's guide?

TURN DOWN YOUR CONTRAST!!!
for the first 300 hours of your plasma, you should watch is VERY DARK!!!
this will avoid that retention. also, use whatever your TV has built in to avoid the burn in effect. some TV pictures actually shake (not noticable to the naked eye), and will help avoid burn in. also find a channel with white noise and let it play for 20 minutes or so...

i pooped my clothes when my brand new 50 in plasma had burn in, but after some research, i did these and it went away, and with the contrast turned down, did not return...

after the first 300 hours, you can set it to normal settings and avoid burn in or residue unless you leave a still image on for about 6-10 hrs.

I have both the Vizio 50" plasma and 32" LCD..

The main thing that bugs me about my plasma is the image retention issue.. If you leave something on the screen for too long, such as a paused DVD, the screen will retain that image until you've watch enough other content to wipe the image away.. And eventually the pixels in the screen will wear out and the picture will become dull.. LCDs don't have this issue..

Also, I personally think plasmas look worse on standard definition channels than LCDs do..

LCDs tend to be a little more pricey than plasmas as you go up in size..

The best thing to do is to have her look at the picture of each type of TV and see which one she likes the most.. And she needs to know that what they're showing in the store is more than likely HD content, so it's going to look great (or at least much better than what she's used to at home)..