Walther PPQ M2. As ergonomic as an M&P, far better stock trigger, and I'd be willing to bet that a comparison with a machine rest would show it to have better mechanical accuracy.
I'm betting near all of these fellas throwing the M&P up as the best choice have never sniffed a PPQ M2, let alone fired one.
Just for the hell of it, I pulled out a Glock 19 3rd Gen, S&W M&P 9, Springfield XD 9 Tactical and Walther PPQ M2 and compared the triggers side by side.
I also compared the triggers to a Walther p99 AS and Glock 23 2nd gen which also meet the OP's specs, but since they are .40 S&W, I will keep them separate.
I dare say a 2nd gen Beretta 92 would possibly be the best of all, but its disqualified by being an DA/SA. A Glock 34 may have been a good choice as well, but doesn't meet the 5 lb trigger req.
Too bad I got rid of my LDA a few months ago or we could have included that.
The PPQ trigger won hands down. Even compared to it's brother the P99 AS, there was no contest.
In order of
my preference based solely on trigger:
PPQ
*P99 AS
M&P
Glock 19
*Glock 23
XD Tactical (great ergonomics, shytty trigger)
* .40S&W
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