Please Help w/Bluetooth MBP connections

Question: what exactly do I need to buy/attach to my 2011 MBPro to be able to connect and use bluetooth stereo headphones (or a headset) to play iTunes?

I have searched this, and other forums, and seen many different results. None of which actually come right out and say what works...

I exercise one hour daily on a skiing machine. During that, I like to read books, and listen to the audiobook while reading (currently LotR and Rob Inglis' CDs). I have tried two different BT stereo headsets, both paired with the MBP, and both allowed me to control iTunes. Hopwever, both would not automatically connect the next day, sometimes not connecting at all. Very big PITA as I'm spending my time trying to get the darned things to work intstead of working out!

So, now I have read that the MBP (Macs in general, maybe?) do not do A2DP, so I need that. But then I see that my MBP is BT2.1 + HDR, so I need that. Is there any adapter/dongle/headset that will do the trick? I appreciate your time spent answering!