Becareful at best buy when comparing HDTV.
Some of those HD sets will be using HD signals and others are using analog, the sales people at my local best buy made a mistake when they talked to me. They explained which TV's were using the HD signal and which had the analog...long story short they didn't realize one of the sets they said had the HD signal wasn't even an HD set, it was just a 32" plain-jane sony. Seemed funny at the time...it had a gray case and blended in perfectly with the gray HD sets.
Another thing to keep in mind HDTV sets can be very tempermental, some are great right out of the box, others may have a problem or two needing adjustment like; red push, over-scan, etc. HD sets are not like old analog TV's that either worked or they didn't, these HD sets have ALOT of crazy adjustments that can and should be serviced.