I've been wanting to connect my Bluetooth wireless headphones (it's got 4.0 and aptx) to my Powerbook running Leopard 10.5.8, but with the inbuilt BT (1.1 IIRC), music is choppy and low quality. What's the best bluetooth adapter I can get for it? USB is fine, but I would more prefer PCMCIA since I would still have a free USB port on my laptop. Thanks.