$.02- throw the desire for less weight out the window. Seriously does not matter when you mention comfort and fit issues. If your existing bike posture has the bars too low get a new stem that puts them where you want them to be. Do this before buying a new bike. It will be a cheap improvement and get you into the habit of getting the bike right for you.
Bar shape, hand position and posture have a lot to do with comfort so be willing to experiment with different bars. Nothing wrong with accumulating a few bars or saddles. You probably have more than one pair of shoes so more than one saddle, tire or bar is
ok. Personally straight mtn bike bars are an abomination for non-racers. Try old fashioned swept back touring or 3 spd bars, Jones bars, etc.
I went from drop bars to Jones bars fifteen years ago and have 3 Jones bars on three bikes. Kona Dew recomendation sounds good.