I am planning to propose my girlfriend. I picked out a ring from a nearby diamond store. I am planning to propose her on her birthday next month She has no idea that I am going to propose her. I am planning to throw a surprise party with some karaoke rentals from Abbey entertainment Toronto ( http://www.abbeyroadentertainment.com/ ) . Will a 1200w works for 1200 sqft? Help me with your suggestions.