IMHO, you can trust the write-ups at headphone.com. That's Tyll Hertsens's old company. You can get somewhat of a reasonable idea looking at the reviews on Amazon, but you're never quite sure of the perspective of the writer. Someone may be writing a review coming from the experience of Apple iPod earbuds. On the other hand, some reviews may be from genuine studio professionals. The trouble is, neither is what you really want to know if you are a budding headphone audiophile. That's the perspective of Headroom. Yes, they're in business to sell headphones and no doubt, whichever model is going to give them more profit is going to get a good review. That said, however, most of the headphone mfrs compete in the same market and pretty much set their price at comparable performance. Headroom can give you a decent clue about how to spread the differences.
Even if some of their reviews are slanted toward the more profitable headphones, you can still take advantage of their 30-day return policy. I'm stating this and I've never purchased a headphone from them. Even so, I've collected a number of headphones through the years in conjunction with my business. I've also met Tyll in person and seen him present at a couple of meets (before he sold the business). Based on my experience and my own headphone collection, Headroom's reviews are pretty much spot-on. If you're a noobie and haven't tried anything yet, it seems like a pretty good deal and is a lot better than trying to figure things out on the open market through Amazon or Best Buys.
P.S. Not everybody can live in or visit New York and walk into a showroom like J&R or B&H Photo. Both are great companies and I've spent $hundreds at each through the years - with satisfactory results. However, you need to know exactly what you want before ordering from either of them.