My dream client is someone who values adventure. 
My dream client is someone who loves to create, breathes to create, and lives to inspire. 
My dream client is a singer/songwriter, or a band, or a one (wo)man band, or... 
I love being a mad scientist, locked away, inventing textures, and sounds. I love mixing. I love the gear I have, and the gear I can't afford. Gear-disease, it's real. 
My dream client allows me to help them achieve their vision, a sonic "dreams come true". Who is your dream client? What type of person do you want to work with?
ps: Every studio should have at least one Beatles book somewhere for your perusal. It is law.