Just wondering if you these sites are easy to outrank? My KW has 70K results in quotes, no TLDs on the first page, and mainly Amazon, Shopping.com, and MSN shopping ranking.
Unless you have literally millions of links like these sites, you can almost hang it up. Settle for being in #5 behind them. Not likely you'll surpass them.
You need to get links of very high importance. If you can get some .edu backlinks it will help. If you look at a lot of data you will see some lower pagerank sites beating the big boys in some phrases. The trick is to have some high quality backlinks as well as massive backlinks from other sources. One way to do this is to use a unique article submission service that can give you a thousand backlinks in 1 day. Then sprinkle in some .edu and pr6 and 7 forum and blog backlinks.
It is not always true. You can beat them easily with good on page and off page factors. You can beat them using keyword url with good off page factors. Though I dont have personal experience, I have seen many urls outbounding amazon.