I saw Forum sponsor VisualApex has a $200 rebate for the Optoma HD7100 for the month of October bringing the total shipped cost to $1049.
If you are having issues with placement of this PJ (VP4001, Z3K) and cannot get the Z12K MII for the low price, it is worth looking at the HD7100 for its lens shift and placement flexibility.
Art had compared the HD7100 and Sharp z3K:
XV-Z3000 vs. Optoma HD7100
Of the projectors out there selling for under $3000 this Sharp is definitely one of my favorites. It's ability to produce black levels rivalling other DLP projectors that use the Darkchip3 processor instead of its Darkchip2, plus excellent color out of the box, and lots and lots of usable lumens, make it one of my two favorite projectors in the price range. The other, would be Optoma's HD7100, which uses the Darkchip3. I should note that I believe the Sharp outperforms the Optoma at both black levels and shadow detail. The Optoma, has, going for it, lens shift, so it is a far, far more flexible projector in terms of placement, but if that wasn't an issue, I would favor the Sharp.
BTW - I am not a fan of Optoma so I am not sure what issues this PJ has.