first tip ... you can't do enough research. read as much as you can to develop a firm understanding of all your options before even starting to buy equipment. the show off your project forum is great for ideas too.
not much you can do about the glare until the backlight upgrade module is finished (there's a thread about it in the LCD section).
as for the DVD in the back ... lots of people rip and set up rear screens (VGA up front, VGA or composite in the rear) as a second monitor. phord has done it ...so have others. you won't have to SEE the incredibles ... but you'll probably have to hear it.
...course you could just tell your kids to read a book or look out the window... and if they complain about motion sickness they get no ice cream!