I think pop comes more from the projector's image quality than DVD vs BR. BR gets you higher resolution, bit rate, better audio.
I recently upgraded from Optoma H31 (480P) to Epson 8100 (1080P). With the same DVD (LOTR: Rerturn of the King) and player (xbox360) there's no comparison in 'pop'. I actually didn't enjoy viewing on my Optoma anymore (granted it's an older 480P with 1800 hrs), but on the Epson it was amazing.
I just got a BR player as well (Panny 60 something), and the largest improvement was getting the new proj, not the BR player. Of course it completely depends on the source material, my LOTR disk (extended version) is probably the best a DVD can look.
Don't get me wrong, BR's are very sharp, but it wasn't the night/day difference like the new projector.
You're on the right track, shop for the best 1080P projector for you and you'll be happy.