I would pick the ST60 if only because TV purchases should last a while and not depreciate as fast as other electronics. If you go with the ST60, even four years from now it might give a picture better than any other TV in its budget range.
If you go with the other option, in four years you will have a mediocre TV and a pile of mobile junk. Especially because none of those mobile devices just released, the clock is already ticking on them.
I mean, if you are a mobile developer that can actually make money off these devices do what you need to do, otherwise the tablet and phone are fast-depreciating toys that are already past their window of peak relevancy.
The bigger issue is FINDING a P42ST60. They aren't made anymore.
If you can find a P42ST60, then buy it immediately and act like Indiana Jones did when he found the Holy Grail. That set is already a collectors edition, so to speak....