Personally I love the SilverStar, but most of the time I hesitate to recommend it for home theatre. That's not to say it won't/can't work, but there are some obstacles that make it less than ideal in some cases.
Yes, the SS is crazy bright and appears even more so if you're doing a direct A/B comp with just about any other screen I've encountered. There's a penalty you pay for that brightness though since nothing is ever free, and you'll notice it the first time you're shooting pool and moving around the table. The SS has a narrow viewing area and you'll notice as you move around the room that the picture does not remain uniformly bright. I haven't measured it, but I would venture to say you have leeway of way less than 30 degrees off center axis viewing before it becomes noticeable.
Also the SS isn't ridiculously fragile, but I would be wary of having a stray billiard ball jump the table and hitting the surface. I've never seen anything like that happen (yet), but I can't imagine the results of such an impact would be good. Same thing with it getting accidentally poked with a cue. Best case scenario your beautiful screen is going to have a chalk smear, worst case you'll indent the screen or god forbid put a hole in it. Sounds crazy but I've seen chalk marks in too many weird places in billiard halls over the years! You mentioned kids so I'm sure you know that what can happen probably will, and at the worst possible moment to boot
Considering these things I'd probably go with a roll up. Motorized or not is a matter of personal choice. I'm lazy and a gadget geek so I would get motorized but you'll pay a premium for it. I'd also probably look for a screen with a gain of around 1.5 - 2....a lower gain would be tough to work with at 120" with your projector without boosting the light output, and personally I'd go with a high contrast gray since your room isn't light controlled. However that last is highly debatable because your Panny is know for having good contrast and black levels to begin with and you say it already looks pretty good on just a white wall.
These are just off the cuff considerations without me doing any serious research so don't take this as gospel. Have you considered doing a DIY on your wall? It's a cheap way to get a great image, so if it gets damaged you can just repair and repaint, no muss and relatively little fuss. Also, since you're new to HT you may not know that most reputable screen dealers are more than happy to send you some fabric samples for comparison purposes. In your shoes I certainly wouldn't pull the trigger on any screen without getting at least a few samples so you can make your own comparisons.
Hope this helps, or at least gives you some direction for your search. So far it sounds like you have a pretty good thing going on in your gameroom!