I am openning a shop. What equipment should I sell

Sell the best equipment that you have never heard!

Maunfacturers are fussy. You can't just say you want to carry B & W and they will open you up.

Well its its been 5 years since the original question and
SOUNDS REAL AUDIO is still in business.
It appears that the equipment sold and the marketing plan has worked.
If SOUNDS REAL AUDIO has made it this far,in this economy my hats off to them.

Lately I was successful selling various Monster Beats head-phones. almost reached to the 70pct of profit.

Like the plumber who's house always leaks, you'll never listen to audio for pleasure again. Why would you want to do that to yourself?
But seriously, best of luck if you do decide to do this.