The Canik Rival seems like the best budget option now.
Even as a "budget" option, I don't think it's leaving much on the table. The trigger is excellent out of the box, better than any Walther I tried and probably the best factory striker trigger I've felt. In fact, it's one of the best striker triggers I've ever felt, without caveat. A few months ago I was really impressed with the PDP, but the Rival is better. You can make the M&P trigger excellent with the Apex, or especially Timney, options, but now you are spending more than a Rival. I have not yet felt a Glock trigger that is close, including the Timney. Even the fully worked over 320 triggers are not good (to my preferences). They can be made light, but the trigger pull is basically just creep until the very back of the pull. Weird feeling.
The Rival also seems to have a much more generous opening for magazine insertions. The M&P magwell is small.