hi saveme ... personally i cannot comment on the pj tx100 as i have never seen one .
only about 2 1/2 month ago i decided to make a choice between a plasma or like you my first projector.
i opted for a Z3 just so i could **** my brother off with is good but tiny pani 42"pv500(i hope he reads this). to be totally honest when i first put it on i wasnt that impressed

as it took me about three hours to find the focus

but when i learned of this feature to put it polite my head blew off . i imediatly phoned him up almost orgasming down the phone while i sat here viewing my 6ft - 3ft screen .
this to me was and still is the perfect choice.including one of the easiest and friendly userfaces that i have seen (once you find the focus

).
like many being a projector virgin i suppose almost any projector would get you a little excited cos if you have been viewing a 28"-32" screen then the jump to lets say 6foot is enough to do this alone!
so you have done the right choice but i think you will still be slightly confused when you leave the forum on wich one to buy so GOODLUCK.
MY OPINIONS ARE MY OWN FIRST Z3 THEN UPGRADE TO A Z3.5