Under the following conditions:
-this is my primary HT display
-I am not going to pay for a pro calibration
-I am not going to do a high level calibration myself with colorimeter and/or spectroradiometer, software, laptop, or other hardware
-I will watch my favorite movies in the dark
I think I would rather easily pay a 4% premium for THX mode, all by itself. Therefore, if the TV costs $1,000, I would easily pay $40 more to have THX.
Now, if the difference is $200, that's tougher. That could go straight to a pro cal, for instance on a S series.
However, without any desire for a pro cal, the G series should allow more consumer-level pic controls.
IMO, the S series was a better value than the G series, at least for last year.
The feature that I would pay considerably more for is 24p w/o 3:2 pulldown, and for last year, that was only the V series on up, within Pana's plasma lineup.
For the OP, I recently put in OTA, and I highly recommend it. These plasmas already have built in ATSC tuner, where I actually had to buy a stand alone to feed my PJ. One time antenna purchase for say $50-80, an RG6 cable for say $10-20, and you get uncompressed, highest quality signals for absolutely free, granted, only so many stations . . . OTOH, I'm somewhat of a sports fan, and it's kind of cool to get the Winter Games, Final Four basketball, all the football games, etc, as highest quality . . . and free.