I just finished running my second session using SR4 and it has really and truly kicked my ass. I cannot think of a game I have done as half-assed a job on, and it's because I'm constantly trying to find rules for STUPID THINGS and it is driving me up a wall.
I would like to round out the game, so I'm considering a system swap. Now, there are plenty of systems that are flexible enough that they _could_ be used, but I have no desire to reinvent the wheel. I'm playing Shadowrun for old school reasons - it has big guns and you get to shoot them at monsters.
As such, I'm not looking for, say, Sorcerer or PTA, even though you could do a great cyberpunk game with either. Best contender in my mind at the moment is something like tri-Stat, but I was wondering if anyone had suggestions for something that's workable for both the genre (Shadowrun - it really is it's own thing) and the old school sensibility I'm going for (Big guns! Ninjas! Dice and shooting!)