\documentclass{article}
\usepackage{verbatim}

\makeatletter
\newenvironment{spsstab}[2][tbp]
  {\setlength{\topsep}{0pt}%
   \let\ORGverbatim@font\verbatim@font
   \def\verbatim@font{\ORGverbatim@font\small}%
   \table[#1]\caption{#2}\verbatim}
  {\endverbatim\endtable}
\makeatother

\begin{document}
\Huge% will have no effect!
\begin{spsstab}[htb]{Table header}
  Another verbatim environment.
\end{spsstab}
\end{document}
