You own a store, you sell 2 brands, which?

Thought experiment:

You run a store which sells used and new gear from any point in history.  The catch is you can have exactly 2 brands.  One of electronics one of speakers. 

Defunct brands are OK as are those current with long histories. 

What brands are they? 
Speakers and amps don't matter. I will only carry snake oil. I heard the profit margins are huge!
Pretty easy decision here. I'd be in on Sonos before they went public and Beats before selling to Apple for $3B.

Well, this is about a retail store, not stock trading. :)