and see if that knocks out any ideas. There are several possible ways, but with CRMs, it is difficult in my opinion because the ones willing to pay good money for a CRM are the ones already looking at Salesforce CRM, and the other giants.
Thanks for your reply , we are looking to make some SaaS based web application. Well a few searches in google about CRM resulted in knowledge of salesforce dominance in the market and a dishearted me.