As a follow up..
If you have a 15' seating distance than the proper (THX) screen size as you will find in commercial theaters, would be 120" WIDE. That's 138" diagonal. While that may sound 'huge' - it equates to what you will see in a properly designed movie theater if you sit in the CENTER seat in the theater. If you like sitting futher back, then go with a bit smaller, if you like sitting closer, then go a bit bigger - but really, if you aren't sure and you LIKE the center of the movie theater, then 138" diagonal is the proper and correct size for your room and setup, as it complies to THX standards and delivers the full benefit of 1080p resolution to your seating distance.
Now - a quick trip over to ProjectorCentral.com and we look for projectors that can give us about 16lm/ft at that size.
The AE2000 from Panasonic can do it... and is one of the ones that will be the most popular throughout the year. I'm not sure I would go with the Epson as it often doesn't score as well as similarly priced competitors for quality.
Understand: The current lineup of projectors will range from very good to excellent. There isn't one that is 'bad' or just 'mediocre'. They are all, at least, VERY good! So, you just have to pick and choose which of these very good projectors is the one you want.
For a screen - I will, as I always have, recommend the Carada Criterion series screens in their Bright White 1.4 gain material. The screen construction is phenomenal - and the screen itself is very typically compared to the Stewart screen of similar build quality that runs 3x the price (or more). The added gain will help with the size of the screen, and really allow images to retain punch for longer as the lamp fades.
The Optoma HD80 and the Panasonic really jump out at me as serious contendors for this setup.
DLP simply bests LCD in my experience when we are talking about serious black level and shadow detail performance, but it is a very marginal improvement. DLP is just a hair better across the board. Yet, rainbow effects can bug some. Also, the HD80 is VERY limited on setup options with a way to serious lens offset... which works fine if your ceiling height allows for it. My 9' ceiling would be fine if my motorized screen had more than 12" of drop from the ceiling - since it doesn't, I can't use a projector like that in my family room. So, you kind of get the idea that your room may somewhat force your hand a bit on the projectors available.
The Panasonic AE2000 has pretty much everything you would want, but may not deliver 100% of the picture quality that a RS1 or a VP60 could deliver. Yet, the added lumen output is a HUGE plus when going up in screen size and when you add a bit of ambient light to the room.
It is, in fact, THE projector I would recommend per your description of the setup, your desires, and the screen size that should be in use.