Reply to New controllers, brand

Hi there!
So... Here is the thing... I'm making a brand for new controllers. I already have contacts to sell these and produce them with a good price.
Now, i'm searching for what people need!

My first controller idea is to round up effects and loop modules... What do you believe? For you, as digital djs, what do you look for? What's the things that you would love to have on a controller?

Starting with just effects and loop modules is easier for the investment and this way I can gain some experience on the market. Later I'll go with a full controller... Even though, ideas? I want to know what you would love to have on the controllers...