Here is a list of BT receivers equipped with aptX
My ASUS Vivobook 200 comes with regular BT but it is much improved with one of these USB transmitters. It's not so much the actual SQ you also need to consider how easy they are to pair together, how long it takes and how reliable the signal is and over how long a range.
I pair mine with this receiver permanently connected to an audio interface.
The NFC option really works. It's cool being able to simply tap a phone on the top and instantly connect. It's not aptX equipped though so you might want to consider something like this.
If ~£100 is to much money for a transmitter and receiver consider those little widgits you can buy off ebay for ~$20.
This one is a bit more expensive than most and says it has aptX.
I'm not sure whats going on with it though. It has exactly the same form factor as all the others (I have a total of 4) which I always suspected as being built by an obscure Chinese OEM and then different sellers simply stencil on their own logo. Are all of them aptX? Is this a special model? Is the supplier pulling a fast one? Any clues?