Recommend: IDE and GUI library

[XavierAP via Digitalmars-d-learn]

Hi I've looked at wiki.dlang.org/IDEs, and I see that Visual D is 
linked from dlang.org/download.html. Still I was looking for 
personal opinions and experiences beyond hard specs, I wonder if 
one of the IDEs is already dominant at least for each OS for any 
good reason.

My requirements are quite ordinary: make x64, debug, go to 
definition, manage projects, code completion. My platform is 
Windows; interested if the choice would be different for Linux, 
if the same nice, otherwise I'd prefer to use whatever is best on 
each OS.

And second question, is DWT the de facto standard for creating 
GUIs? Or are there good competitors.

Sorry if I'm asking something too obvious, though I've looked 
around for answers before. And I've also searched the forum but 
really equivalent questions were over 2 years old and many things 
may have changed.
Thanks!