If the reliability and what not were better the 16-50 and 50-135 would be the obvious choice, but with all the above mentioned it's hard. I'm still seriously considering getting the 16-50, although I hear that a replacement will be coming out soon according to the road map which will be nice.
I wish the Pentax/Tokina agreement ended up with the 11-16 coming out. My cousin has that lens for Nikon and loves it. That is great for indoor shooting and landscapes. That combined with your 18-135 would have been perfect, but alas.
Frankly for what you described the lenses you have are probably the best two for what you are looking for. The 16-50 would eliminate the need for the 15mm. You lose 3* of view, but gain the extra stop. You'd probably find that the 18-135 wouldn't be mounted very often.
Honestly i'd keep what you have and pray that the replacement for the 16-50 gets announced soon and wait to buy that. That's my plan right now. I'm in a similar boat as you, but I have a 80-200/2.8 combined with a 150-500 for wildlife. I have an old M50mm/1.7 for indoor stuff that while manual, is still a great lens. I'm in need of a wide angle as I want to start doing more landscape stuff, but I'm holding out for the new lens since I need WR. If I can find a good deal on the 18-135 I'll snag it, but I'm really hoping that something comes out in 17-70ish/2.8 with true WR.
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