Gaussian basis sets

 As a new user of Gaussian 94 for windows I would appreciate advice on the best
 basis set for the calculation of ground and excited state dipoles.
 the molecule is a 20 none hydrogen atom nitrogen heterocycle, +1 charge.
 It will be a single point calculation on a crystal structure. I have a Pentium
 90 with 16MB ram.
 Any help much appreciated
 Paul Heelis
 Heelisp $#at#$