I generally recommend that people do their home entertainment shopping at specialty stores, rather than chain or department stores. Two reasons: the former generally have more knowledgable staff, and the latter generally do not have higher end equipment.
But the former reason doesn’t always hold. During my HDMI cable search I got into conversation with one of the sales guys at Harvey Norman in Philip, ACT. This fellow turns out to be an enthusiast himself, has been in sales in this field for several years, and knows rather a lot. So if you’re confused and Harvey Norman stock is more in your price range than hi fi shop equipment, go there and ask for Stan.