first of... koko: you have a 100".. wow!!.. those things are massive!!..

second.. I just got a 37" 1080p... and as said if you watch regular TV they all look the same as my other regular TV.. but.. I rented some dvd series.. plain dvd not blueray..and man! they almost look blueray... so vivid and they just pop out...

not sure about the 720p as I don´t have one... but if there´s not thta much $ difference... it´s your call.. i bought mine on a 13 months without interest payments and it inlcluded a home theater so it was practically a steal...