Sony 34XBR910 vs 34XS955

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I currently own a Sony KD-32XBR450 and I'm seriously thinking changing it
for a Sony 16-9 tube. I know the KD-34XBR960 is the best buy but it is not
available in Canada.

So I have the choice between last year's model -a demo- 34XRB910 (no HD
tuner) and the new 34XS955 (no twin pic). The 34XRB910 is a 6 months demo
and still is $300 CA more than the 34XS955.

My question is: which tube offers the best picture quality? Is it the same
tube? Will the XBR last longer (better quality parts).

Thank you.

Jean-Pierre