The Steyr guns seem pretty decent. Those 25 year old original AUGs are still alive and kicking, can't imagine the new ones would be any different. But I've read the AUG factory triggers are horrid (~9 lbs).
The PS90 has a slightly better trigger than the FS2000. But you won't get the same kind of long range performance with the smaller cartridge and all.
Umm, my brother's MSAR never did work right and I think Shipwreck said that company is out of business now, guess he might be SOL with a gun that doesn't work.
There's also a company that makes a product called the 'trigger tamer' for certain bullpup rifles that is supposed to smooth things out a bunch. I didn't feel like messing with it however. My FS2000 had the original trigger pack with the safety sear and the last thing I want to do is alter/modify that thing, especially with the ATF out of control under the current regime.