i've got the fiscon Basic bluetooth kit - love it!
cheaper than the OEM kit, easier to install than the OEM kit - just a box, the loom that goes between the factory plug and the radio and the mic and thats it!
integrates with the RED MFD, also gives you the added bonus of the E-MFA, so you get number of litres left, boost, oil temp, speed and a few other bits and pieces assuming its supported by your engine. sound quality is superb, also supported A2DP with my old blackberry Bold 9780 without a single issue whatsoever, just pressed play on that and it came through in the car, now also supports it on my galaxy nexus!
i believe the difference between the basic and the basic plus kit is the basic plus allows you to see the address book on the RNS510 - i didnt require this function and i got the 'Basic' version kit very cheap off ebay.de so opted for that!
good luck!