Well...here's my crazy path.
I bought the 77ltd a few years back. It is a great lens. Around the same time, I bought the 50-135, which is also a great lens. I found that while the 77ltd may be a little better, the 50-135 was close enough for me, and it was a zoom. So, I sold my 77 Ltd.
However, today I just ordered the DA70 Ltd since I've gotten on a DA Ltd kick (I will soon have the 21, 40 and 70, plus the handy little case). So, I guess I can't really tell you what to do. Any of the lenses you're talking about are great.
Just for kicks and giggles, I took some similar shots with the 77Ltd, 50-135, DA*200, and 18-250 and put them into a
set here. What I decided is that all of these lenses can be great under certain circumstances. However, the DA* or Ltd lenses can really look lovely.