Android to PC communications via Bluetooth

I am needing an app that mimics this app currently available here [justremotephone.com]. It has a nice set of features but also lacks a lot when it comes to the SDK/API. Please also check out a video of their app [youtube.com/watch?v=7zBI8Gr4Kmg] in order to get an idea of all that it does to better help you vision what I am looking for.

The features I am looking for in my app are the following:
- Ability to call a number (from the contacts list (showing image(s)) or Dial pad)
- Ability to answer a call (shows the users image and phone number on screen)
- Ability to hang up a call
- Ability to get the contacts (with images)

The SDK/API needs to do all the above via listeners (especially listen for incoming calls). It can be coded using VB.net or C#.net.

All communication will need to be done over Bluetooth. I will not want to use Wifi or USB for this.

My max spending for this will be set at $100 or less (naturally the lowest offer will be first to be picked based on experience). If you quote something higher- than don’t bother posting it here. If you do post it at a higher price than $100 then I will delete it.

My development environment is Visual Studio 2010/2012 running .net framework 4.0.

If you have any more questions about this then please feel free to contact me.