I'm also currently working on the same choice. I got a Mitsubishi HC 100 last week (DLP) and although I found the picture excellent my wife saw oodles of rainbows and had a headache in 5 minutes. Thankfully the lovely people at projectorpoint have agreed to take it back and are letting me exchange for another.
So because of the wifes optical deficiencies (

) I am going to have to get an LCD! The only two in my range seems to be the Z3 and the TX100.
The Z3 seems to have better contrast (2000:1) but worse light (800 lumens) while the TX100 has worse contrast (1200:1) and better light output (1200 lumens).
I can't find any info. comparing the 'Barn door' effect on these 2 projectors.
Does anybody know if the Themescene H30's more advanced DLP chip and faster colour wheel has managed to significantly reduce Rainbowing?