Hi, Karen

with the external Xtal or reso ... 16F628/648 will be unbeatable !!!
with internal 8Mhz clock ... 16F88 or 16F819 ...

18F1320 ... I had small problems with mine ( no more than 20 reprogrammings available , EEPROM single location programming ... FALSE !!! Works well ONLY with more than two writings ... )

searchtool here also:

http://melabs.picbasic.com/Scripts/perl/picsearch.pl

Alain