BMW e46 BT system

[BMW343]

Hi all

I have a e46 320 BMW with the Business CD and 6 cd changer in the boot

Looking for guidance on which Blue Toot system to get
I have an iPhone 5 s

Just want to make and receive calls and listens to music from the iPhone. Dont need anything fancy -- Car is used going to and from work but need to ring home to see if I need get shopping in on the way home that type of stuff. Sat NAv or camera units not really a necessity

Any guidance on which system to get

Many thanks

Tadhg