I would consider looking at an LED model. at the 40" - 46" screen size the LCD & LED technology as matured massivly over the past few years. Have a look at THIS is one of the latest models. It's packed with features and i imagine its within the price range of what yuou spent on your current plasma?
I live in Italy and the model you suggested is the 42lm620s for europe . The price is good (about 700 euro) but I don't know any review of this product . I'd like a plasma but... if the image of a LED will convince me ...i will can change technology .