I think I have a bit of info on the costco.ca deal coming up that might be helpful. I did some research on the W1250 that Costco is showing on the website which appears to be identical to the W1070. I poked around on the Benq website and found a W1250 Manual.
while it's not shown as a model in the US or Canada, if you select Australia as your country and go under support/downloads, you can select the w1250 and find the pdf manual for download
The W1250 looks physically identical to the W1070.
The manual is virtually identical to the W1070/W1080st manual with a couple of very minor edits
- all reference to the 1070 and 1080st are removed for obvious reasons
- the remote control is different - this one is now back-lit - some buttons are added and some are removed (info, smart eco, digital zoom and CC are removed from the remote. A fine tune for color temperature has been added to the remote. the are now separate power on and power off buttons on the remote. There appear to be three new buttons which are not supported - Wireless, SRS and PIP)
- the height is listed a 104mm compared to 109.26mm in the 1070 manual
- the weight is indicated as 2.75Kg compared to 2.65kg in the 1070 manual
everything else appears to be identical-
same features, same lens
same throw, zoom, lens shift, color wheel, ISF mode, etc, etc, etc
menu system is identical
based on this, it seems the 1250 is a re-badged 1070 with a back-lit remote