Calling Card service needed

We're looking for someone to build a simple voice-activated calling service using the telephony engine at http://www.softivr.com. What we need is a front end website where people can:- (a) register (and we confirm their e-mail address) (b) add credit to their account through PayPal (c) specify their caller ID (used for authentication when calling) (d) specify a list of names and telephone numbers. This front end needs to talk to a back end at softivr, The back end should:- (a) look up the caller's caller ID (b) get a list of names and numbers from the front end (c) build a speech recognition grammar (d) get the caller to tell it who they want to call (e) check that the caller has sufficient credit to make a call (f) place a call to the specified contact (g) charge the call to the caller's account. There's an example using a Google contact list at [login to view URL] As well as the code, we're looking for an attractive, simple design. PM me with any questions. Thanks -- Dave