Astro,
Yeah, I know J&R, however, these were the guys that recommended the Bose Cinemate and then open returning the item, highly recommended the more expensive Bose V20 as the only surround sound I'll ever need... A real shame, as I agree with you, I really like the store and they do offer some great deals.
Stereo salesman aren't any different than car salesman- they get paid to push the products with the best spiffs or markup. Companies like Monster Cable pay some lavish bonuses to the stores/salemen that push the most of their junk, and I wouldn't be surprised if B[l]ose is the same way. There's a reason they never set their demo up near other speakers: nearly everything else at 1/2 the price or more will sound better!
Still, expecting good advice from a kid at J&R is like expecting good automotive advice at Wal-Mart. The guy in the A/V dept might have been in the home appliance isle the day before. Skilled, knowledgeabe commissioned sales people are largely a thing of the past nowadays. All is not lost, however. Do your research online (this site is a great place to start), then listen to the products at your local stores.
As for internet-only companies, most offer very generous return policies. They know the only way to really know how something will sound is to hear it in your own home, in your own system with your own gear & music. No matter how something sounds in the store, be advised that it will sound different in your home. There's no way around that, it's a fact of acoustics. Not to mention the fact that the brands they push the hardest (ie the most profitable ones) will be set up more carefully. You ever notice some of the cheap store brand stuff is just stacked on the end of an isle? How are you gonna "evaluate" a pair of speakers set on the floor, 1 foot from each other? You can tell they're not making a big effort to sell that product- which might mean you should check it out!
Lastly, read the reviews, but don't let them be a substitute for your own listening. You're the one who has to buy them & you must live with 'em every day. Ultimately you're the reviewer that really matters.