If you know nothing about projectors, then just ask for some options. Tell us where you would like to sit, and what you are hoping to achieve. You are like 10 steps down the road, when you need to be back at step one or two.
1. How far away do you intend to sit from the screen?
2. Where do you like to sit in the theater (front/middle/back)
3. What are your technical capabilities?
4. Can you ceiling mount the projector?
5. Can you run power to the projector and cabling to a ceiling location?
6. Can the projector go anywhere on your ceiling within the limitations of the room?
7. Do you have audio already setup for the room?
8. What budget do you have for the projector (and just the projector)?
9. What material will you be watching on screen?
10. What are the room lighting conditions like?
11. What are the room paint colors like (wall color? ceiling color? floor/carpet color (and material)?)
My initial reaction is that your ceiling height is going to impact your purchasing decision immensely. You have a 6.5' tall ceiling. So, projectors that have 8"+ of offset, putting the screen over a foot off the ceiling, aren't appropriate. On the cheaper side ($1,000ish range) that means the Epson 2030 or the BenQ W1070 or the Epson 8345 or the Panasonic AR100. The 8345 and AR100 don't support 3D, but have significant lens shift which allows for easier placement in the room and look pretty good.
The 2030 has negative lens offset, which means the projector lens is UNDER the top edge of the screen, which may be good for the room you are in. It looks good, but if you don't care about 3D, I may opt for the Epson 8345 instead.
The W1070 is the best looking of the bunch. It must have the lens about 2" above the top of the screen, so with a tight ceiling mount installation, the top of the screen would be about 6" or so away from the ceiling, which is pretty good. You can get about a 100" to 130" diagonal from a 11' lens to screen distance with the W1070 which is also pretty nice.
You can ignore the 'red' color on the Projector Central website for the calculator. It tells you what it means, but most people don't get it... So, just ignore it.
Once you have answered ALL the questions I gave, then we can get into the specifics of what you may be looking for. But, at this point, it's just general recommendations and guesswork since we don't know enough to give you a really accurate answer.
Perhaps the JVC X35 or Sony HW40ES are better choices for you.