Hjorimir said:
True20 would be my suggestion. It plays a lot like d20, but is MUCH faster and you can do anything you want with it.
If simple is the goal, Id go with either d20 Modern or True 20.
Wait, I said d20 Modern?!?!? OMG, looking at most of the posts here, you'd think I'm advocating playing Russian Roulette with 5 of your closest friends.
But it would definitely be simpler. Why?
Because if your group is already familiar with d20, then d20M would have the gentlest learning curve. After becoming familiar with the basic classes and advanced classes, your players could probably see almost instantly how to stat up the iconic characters from movies and fiction they plan to base their PCs on.
As for combat, eliminate AoO and d20 Modern combat goes very fast. First, many more people have ranged weapons (guns). Secondly, those weapons average a little more damage than bows (about twice as much in fact). Add to that, that d20M PCs aren't *quite* as diesel as their D&D counterparts.
These changes make combat start sooner (PCs don't have to close, and they aren't trying to close like chess pieces to avoid AoO). They also make combat faster, since the PCs are slightly less sturdy, and weapons do a little more damage.
But if the goal is cinematic, d20M delivers that with the least amount of book fumbling. Playing Spycraft 2.0 was the world's most frustrating exercise for me and my players. There are a LOT of little rules differences that mired down play for us weeks down the line.
(I KNOW I KNOW... I'm speaking heresy here on these boards. But these are just my experiences. Your mileage may defeinitely vary.)
Now True 20 is very streamlined. But still has a relatively light learning curve.
Again, your PCs can look at the roles and feats, and begin statting iconic PCs that they want to play in minutes.
So for cinematic, simple, and robust, those would be my choices.
Chuck