chulaivet1966,
I agree with most of the things you said.
Especially about specific questions.

The thing that troubles me the most is mixing. Sadly, I am a bit sloppy at that.
I am getting a bit better, after I discovered that for mixing it is better (in my view) to use open or semi-open back headphones. I had tough time with settling on monitor speakers. I considered KRK Rockit, but then got Roland DM-20 at great price and decided to keep them. The "professional" monitors are out of my budget. I used cheaper Edirol's in the past, so I knew what to expect.

Like you, I am concerned how mix translates to other systems. As Floyd Jane suggested, I posted my recent tune to "showcase" section and within few hours the replies I got shared a view that mix has issues which I believe are in part of the "how mix translates" dilemma smile

Thank you.