If you are getting a 46" TV, I strongly suggest getting Plasma. Bascially any TV (46" and above) is recommended to use plasma as it has a smooth, non-edgy look compare to LCD.
Most LCD is using 50 Hz (unless you're getting 100 or 200 Hz). But take note, higher Hz = higher price. Panasonic is indeed the leader in Plasma TV, and have you wonder why plasma is always use during F1 race in a big screen?
I'm using a 40" Samsung LED 6 series, got it for $2199 at Comex. Do consider what functions / areas you want on a TV rather than the size.