[Tex/LaTex] vertical space between paragraphs and `topsep` in \usepackage{enumitem} cancel each other out

Question

I'm using \setlength{\parskip}{\baselineskip} to insert vertical space between the paragraphs in my document. However this create a conflict with my list environments. To solve that I am using the enumitem package to set the space between the last line before my itemize environment and my first item to =0pt however, the paragraph spacing created with \setlength{\parskip}{\baselineskip} cancel this out. I can get at it by setting topsep to ~ -9pt, but them I loose the spacing between the last item and the next paragraph (MWE is below). I have deliberately chosen noitemsep as I also want less spacing between the individual item, I would like to keep this.

\documentclass{article}

% insert vertical space between paragraphs
\setlength{\parskip}{\baselineskip} 

% Modifies itemized lists with enumitem http://www.ctan.org/pkg/enumitem
\usepackage{enumitem}
 \setlist[itemize]{noitemsep, topsep=0pt} % , topsep=-9pt

 % http://tug.ctan.org/tex-archive/macros/latex/contrib/blindtext/blindtext.pdf
\usepackage{blindtext} 

\begin{document} 

\blindtext

\noindent
This is the things cancel each other out:
% space I would like to get rid of is here!
\begin{itemize}
\item dummy first item
\item insert vertical space between paragraphs
\item \verb|[topsep=0pt]| in \verb| \usepackage{enumitem} |
\item dummy last item
\end{itemize}

\blindtext

\blindtext

\end{document}

Answer 1

Add before={\vspace*{-\baselineskip}} to your itemize options:

\setlist[itemize]{noitemsep, topsep=0pt, before={\vspace*{-\baselineskip}}}

MWE:

\documentclass{article}

% insert vertical space between paragraphs
\setlength{\parskip}{\baselineskip}

% Modifies itemized lists with enumitem http://www.ctan.org/pkg/enumitem
\usepackage{enumitem}
 \setlist[itemize]{noitemsep, topsep=0pt, before={\vspace*{-\baselineskip}}} % , topsep=-9pt

 % http://tug.ctan.org/tex-archive/macros/latex/contrib/blindtext/blindtext.pdf
\usepackage{blindtext}

\begin{document}

\blindtext

\noindent
This is the things cancel each other out:
% space I would like to get rid of is here!
\begin{itemize}
\item dummy first item
\item insert vertical space between paragraphs
\item \verb|[topsep=0pt]| in \verb| \usepackage{enumitem} |
\item dummy last item
\end{itemize}

\blindtext

\blindtext

\end{document} 

Output: