sms texting platform

I'm looking to set up a bulk SMS marketing platform. Here are the needs, and my 'wish list'. I am looking for someone to set this up for me on a server. the sms system must: send unlimited sms texting to all major US cell phone carriers have the ability for recipients to 'opt out' wish list: server based (preferrably) some sort of login 'interface' that would allow multiple users all for the upload/import of lead lists time scheduler/throttle