Just wanted to follow up now that I've had the 42s60 for a couple of weeks.
I totally love it and have no complaints, though it is my first plasma.
On the discussion of price and if bigger is in fact better...my living room is not very large and the couch isn't far from where the TV sits, and there's not much room. A 50" TV would look really big there. 42" hits a total sweet spot for us. It doesn't overwhelm the room but it's perfectly big enough to enjoy watching.
As far as the glare is concerned...my girlfriend had the best answer when I said "if the sun hits at a certain time during the day the TV will be unwatchable". She said "we shouldn't be watching then anyway, we should be working". So that's that. Fact is, the glare was an issue with our CRT as well, and if it's the middle of the day and I need to watch Lawrence of Arabia, I'll close the curtain.
As far as the internet is concerned, I mentioned this before, it may not be cutting edge or have all the features of the ST series, but it's really incorrect to say these are "missing internet". I've got all the major apps and few not so major, I'm streaming youtube from my phone, etc.
Anyway, I haven't done any major calibration or even used any settings as posted here. Put everything in cinema mode, turned off auto-brightness and switched to Warm 1 and I'm pretty satisfied. At some point I may dig deeper into the settings but I have no complaints.