I have built three houses with theater rooms in each. For these purposes, I would go to a store like GHT. That said, don't plan on getting any deal as you are paying for that overhead including the furniture and art.
For my two-channel area, I would not waste my time going to a Home Theater store, They are just a different breed and they generally do not have higher-end equipment. I am going to any store that has the components or speakers that I may be looking for., I could care less whether they served my whiskey while I was listening to a component. It is all about being able to compare side by side of various components that I am looking to demo.