With $2K, you can go up to a 50" if you have the space available. I've been looking at the Panasonic TC-P50V10.
THX Certification (Has to pass THX standards, and kind of acts like an auto-calibration for display settings)
swivel platform (A must for us because we like to adjust the viewing angle for different seating positions)
VieraCast Interactive TV (Ethernet Port)