For 400 dolalrs more you can get 1080 if your budget allows. I have no problems with my 720 I am worried that when my buddy gets 1080 I am going to have to upgrade as well.
Heres some links to check out
Projector
http://www.costco.ca/Browse/Product....=1&topnav=&s=1
Screen you can choose any screen from tigerdirect good prices fast FREE shipping no duties and the screens work great
http://www.tigerdirect.ca/applicatio...170&CatId=2434
And roof mount.
http://www.monoprice.com/products/pr...seq=1&format=2
Total probably around 1400 after taxes and what not. You can save money by going with a cheaper screen but with the prices projectors are today I would go for 1080
Since you want it today. You can pick up projector at costco. Use just a white wall then your screen and mount will be here within a week.