I personally went with the Samsung DLP. It's much faster than the Sony's (LCD's - ever wonder why computer gamers don't use LCD's?????? The refresh rate is usually why!) I got my 61" DLP for just about $5000, but that was from a local dealer ad with extending warranty. I've seen them on line for about the $4K you're looking for.
I watched it side by side with the Sony's and my wife even agreed it was better. FWTW.
I watched it side by side with the Sony's and my wife even agreed it was better. FWTW.