I'm familiar with rooms which are impacted with roof lines, if that's what you can fit, than that is fine, but you can still do two rows of seating for sure as ideal for a 106" diagonal is about 11' viewing distance.
There is no DaLite screen (unless used) that is similar in quality to the Carada Criterion screen at a lower price. DaLite and Draper both have 'cheap' models, but their similar models cost more than the equivalent Carada screen.
The Cinema Contour:
Cinema Contour®
from DaLite runs $1,527 (MSRP) for part # 87160V which is their 1.3 gain 106" diagonal screen. This has a angled velvet covered border on a large sturdy frame with rear mounting.
It's a bit over $1,000 online for that screen.
So, for a similar quality screen the least you will be paying from DaLite is about $200 more than the Carada screen.
The Da-Snap screen is lower quality frame and still more expensive. So, I'm not sure what fixed frame screen DaLite has which costs less. Unless you go used, which may be a great way to get a very good value screen.
There are tons of posts of plasma vs. LCD for flat panel displays, but the bottom line is that while LCD can be brighter, it suffers from certain weaknesses which are inherent to the LCD technology. For a flat panel, going Samsung LCD is about the best way you can go. Sony is right up there as well. Sharp is weaker, but has some nice stuff. But, if you want better black levels and extremely good image uniformity with as good as it gets motion handling, plasma trumps LCD. In a bright room, the glass and lack of brightness can be an issue, but when it gets dark and it is movie time, the plasma will just look better. The lower price tag helps as well! Panasonic VT series is phenomenal, and the Samsung 7000/8000 series are both extremely good looking. Panasonic VT series really aren't a lot 'less' than what a Samsung LCD/LED may run you, but the image is the best in the game with reliability that is (typically) second to none.