A smartphone that supports APT-X is the first thing for most people to get on the total wireless wagon, such as Samsung Note 2, Galaxy S3 and S4, HTC One, etc.
If you are a radio junk like me, you can use an Avantree Saturn ($36, Amazon) to transmit it over Bluetooth. You can do this to any audio source such as TV. The Aventree can also be used as a receiver like the HS3000 for headphones etc., but it does not have volume and track controls and Mic. Yes, the neat mail-mail 3.5mm connector is included, very nice.
If you use a laptop for music, game, movie, VOIP ..., you can use an Azio BTD-V400 ($12, Amazon). During the software install, lots of auto-start craps are added on your computer. You can run msconfig to disable them all except the "CSR Bluetooth Service" which is the only thing really needed.
All you need is a Samsung HS3000 ($38, MobileFun), see my last blog for details. Don't waste your money on Bluetooth headphones, they are all over priced and they all have lots of problems.
HS3000 is a multiple-point device, i.e., it can be paired to two devices at the same time. If my Note 2 gets a call while I am listening to my HD radio, it switches automatically to the phone.
For your car, HTC Car A200 ($25, Amazon) is a good choice. It never go into sleep; whenever you get into your car, it is there ready to serve you. You simply press its button and your music starts in your car's speakers.