Between October and March is the ideal period to visit Ajmer and Pushkar while you are organizing your "jaipur ajmer pushkar trip". The temperature throughout these months is mild; neither extreme heat nor cold. If you time your visit, you will also have the chance to see the well-known Pushkar Camel Fair.
Regarding trips, think about starting a five-day Rajasitan trip with Bhati Tours. They provide great facilities that guarantee you stay within your means and experience Rajasitan ethnic culture and customs. From the world-known Brahma Temple in Pushkar to the holy Dargah Sharif in Ajmer, their well designed schedule offers an amazing trip throughout these fascinating towns.