The motion blur really odes not effect me much or at all on my tv.
I think it impacts some and not others, kind of like the 'rainbow effect' with DLP sets.
your Sony Wega 50A10 is a LCDRP set not direct view LCD. Rear projection sets normally have a similar response time to Plasma (4ms)so you will not notice motion blurring like you would on a LCD with an 8ms response time or greater.
The 50A10 is one of my favorite LCDRP as it shows minimal screen door effect and actually can resolve every line of a 720P test pattern. Gary Merson did a test on several sets a few years back and most notably the Sony A20 series and the Sharp LC45GD5U which did not resolve all 1080 lines as advertised.
I found it a bit shocking that Sharp performed that way, but as some said to me, they make the best LCD panels, but not nesessarily the best videoprocessors.
Here are a couple links to the Merson articles.
2007 HDTV resolution article Are you getting all the resolution you expected ? round 1 Are you getting all the HDTV resolution you expected? round 2 Are you getting all the HDTV resolution you expected? Round 3