The X1 series Panasonic Plasma televisions are now available from sites like BestBuy.com.  According to HDGuru.com:

The X1 series replaces the 2008 PX80 models.  These 42” and 50” plasma HDTVs retain the 80 series 768p resolution.  Improvements include: new styling, new AR (anti-reflective) filter, improved contrast ratio (30,000:1 vs. 15,000:1) and 600Hz sub-field drives.  These models are now appearing on store shelves.

Model             Price

TC-P42X1        $899.95
TC-P50X1        $1099.95

 
You can find the manuals for these televisions here.

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