  We present stellar parameters and metallicities for 29 planet-host stars, as
well as for a large volume-limited sample of 53 stars not known to be orbited
by any planetary-mass companion. These stars add to the results presented in
our previous series of papers, providing two large and uniform samples of 119
planet-hosts and 94 ``single'' stars with accurate stellar parameters and
[Fe/H] estimates. The analysis of the results further confirms that stars with
planets are metal-rich when compared with average field dwarfs. Important
biases that may compromise future studies are also discussed. Finally, we
compare the metallicity distributions for single planet-hosts and planet-hosts
in multiple stellar systems. The results show that a small difference cannot be
excluded, in the sense that the latter sample is slighly overmetallic. However,
more data are needed to confirm this correlation.
