Once I would have said Sony, but it seems their quality has dropped off since I bought my Bravia five or so years ago. Sharp appear to have upped their game panel wise lately, and LG are very good. Panasonic have always been very reliable as well.
I may be telling you stuff you already know, but one thing worth keeping in mind when viewing sets; the picture you see in the showroom is often set using a default setting to make it really bright, ‘Vivid’ being one such, so make sure the contrast ratio is as high as possible, and look for over-emphasis at the edges of contrast areas. Look on the interwebz for fine tuning the picture settings, there are often a list of advanced settings that you can use and then fine tune to your personal taste.
Like I say, you probably know all that, but it’s dead easy to get carried away faced with several dozen whizzy new tellies all arrayed in front of you and forget. 😀
My Bravia was tweaked several times until I got it the way I wanted it, took about an hour in total.
600 squids ought to get you a damned good 40-42″ set, my 40″ Bravia was £1400, reduced to £900 at Christmas, bought on Boxing day, and I haven’t regretted buying it for one second, it’s a beautiful set, and things have moved on a lot in five years. Have fun!