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I'm not really sure what you mean by "which will allow resellers set up their own prices for domain name & hosting registrations /renewals.". If you maybe give an example, I can try and direct you better
It sounds to me like you want to be able to offer your customers a domain reseller, so they can set their own prices and sell your own domains.
I can't help you out on that one, but for billing software I would strongly reccomend WHMCS. As others have said, we have been using it for about 3 years now and really can't fault the product of the support.
Probably you are looking for H-Sphere if you wish to manage resellers and each reseller to have its own branded control panel (with billing, provision, support, knowledgebase, domain registration etc.).
Otherwise, for Cpanel/WHM, each reseller must setup and use its own WHMCS (or similar software).