What are your criteria?
I'm still a great fan of the 50-inch Pioneer KURO plasma I ordered during the sales last year. No, it's not LCD.
In the size range you've mentioned, I'd probably get a Panasonic G10 plasma, or if sticking literally to LCD, a Sony 40V5100 (was on sale with free PS3 earlier this week, helas), or a Samsung B600 (B640 looks best -- it's not ToC red or bearing a horrid 'chin', but B650 has most features).
Interested punters should probably read
this comparison of 40-42" TVs.