How to change arrow tip in tikz

Is there a simple way to increase the size of an arrow tip using something like:

\tikzset{myptr/.style=->, ????}

without designing a new arrow style from scratch?

One solution, very quick, to just scale the arrow head is number %2 in the following:

\documentclass[multi=false,tikz,border=2mm]{standalone}
\usetikzlibrary{arrows,decorations.markings}

\begin{document}

\begin{tikzpicture}
%1
\draw [->,>=stealth] (0,.5) -- (2,.5);
%2
\draw [decoration={markings,mark=at position 1 with
    {\arrow[scale=3,>=stealth]{>}}},postaction={decorate}] (0,0) -- (2,0);
\end{tikzpicture}

\end{document}

This produces:

(sorry for excessive zoom).

Much more in the answers to this question and in this answer, that I used as a source.

Addendum

\tikzset approach. This code:

\documentclass[multi=false,tikz,border=2mm]{standalone}
\usetikzlibrary{arrows,decorations.markings}

\begin{document}

\begin{tikzpicture}
\tikzset{myptr/.style={decoration={markings,mark=at position 1 with %
    {\arrow[scale=3,>=stealth]{>}}},postaction={decorate}}}
%1
\draw [->,>=stealth] (0,.5) -- (2,.5);
%2
\draw [myptr] (0,0) -- (2,0);
\end{tikzpicture}

\end{document}

produces the same output as the above one (source: PGF Manual, section 2.8).

Obviously you can use -Latex instead of stealth.