Did a search but found nothing.

Am a recent Mac switcher and impressed by ease of use. I wish to stream music from my external HDD to stereo.

Have an Airport Express and it works great. With external HDD connected to my Macbook I can listen to my music.

Now I want to hide that external HDD away and connect to it wirelessly.

I am debating to purchase an Extreme or Time Capsule. Heard that streaming from the TC is not ideal, but would only use it as a back up feature, while the external HDD would provide the data.

Any thoughts?

If one later wanted to add a NAS how is the compatibility with the TC?