My suggestions are going to based on what you are looking to spend, and the intended use. In all reality the Ruger MPR is a decent rifle (or pistol) out the box. If the trigger is the weak point, you can easily opt for a drop in trigger (Timney, CMC, or Elftmann). I can't think of a factory rifle (even rifles north of $2K) that I wouldn't swap the trigger for something better.
With that said, I try to steer folks in the direction of building your own rifle/pistol. For a couple of reasons... 1st and foremost you control all of the components installed in your build. I have boxes of shit that I've taken off of factory rifles. The 2nd being, one becomes familiar with how their rifle functions when you see how it's assembled and the inner workings.