"2) 1080p should be a standard particularly with the advent of Blu-Ray & HD technology"
It is the highest "HDTV" standard. Your question is, what percent of my current and forseeable future source material will be 720p, 1080i, 1080p.
1080p is not that common now, unless you have Blu-Ray or HD-DVD players.
At the other extreme, if you have SD cable then you are getting a 4x3 aspect with about 330 lines. This is what I watch 75% of the time. My TV upconverts it for me to I think 480p.
The rest of the time for me is DVDs (720) and Games (1080i)
The "sweet spot" now for Plasma/LCD TVs seems to be 1080i.
"5) ISF Calibration is mandatory to get the best picture quality"
I think this is true with CRT, Rear projection , PLasma, not sure about LCD panels.
"6) Pioneer rules over Panny Plasma picture quality wise but can cost alot more ie: not best value?"
That is entirely your call!