I'd like to second what's been said about the TT31. I've had it several years with no problems, other than the antenna co-ax failing tiwice (which it also did when I had the KT76a). Found Trig tech support very helpful indeed.
However, do consider the ergonomics. The Trig is a no-brainer if you are replacing a KT76a. But if you are having wiring done, do consider the Garmin or King equivalents with their numeric keys. The Trig's 'turn and click' control is less that intuitive and takes a little getting use to.