I'm sorry for any confusion on the direct linking part.
By direct linking, I mean to use a redirect that direct links to affiliate product, not using the raw hop link.
Ezine doesn't allow a raw affiliate link, but they do allow a straight redirect, as long as it's a top level domain redirect. IE:
allowed -
www.niche.com
not allowed -
www.niche.com/niche
Also, when doing keyword research, don't always rely on keyword tools alone for good keywords. Most of them will seem heavily saturated already, and may discourage you on entering a potentially profitable niche when you check the competition.
Instead, take those same keywords or figure out some of your own for the niche and start checking good ole google suggest, like I said before some of the best buyer keywords are hidden right there.
Also, if your going to do a blogspot setup right now, combined with ezine, there's some good money to be made right now in the physical product area using amazon.
Primetime shopping for micro niche's
You could slap up a quick blog, on 3 of the best camcorders for example "JVC Deluxe 4339", "Sony Whatever 3088" etc. and write some ezine articles specific to those models connected to your blog.
Ezine articles ranks freakin super fast in google, if you can plug away right now at some real micro niche type keywords for high ticket items, you could really bank it up right now why everyones hot to buy.
Or, just buy a .info domain, make the name something like "www.bestcamcorders.info" that redirects to an amazon page with the best camcorders, write all your articles on specific models. The point of this is, their already looking for more info on the model, you inform them with your article that takes them to amazon where they can get a good deal on that one or another one.
They may even finish all their holiday shopping through your link while their there. They might buy suzie that wii game they wanted, grandma edna that back massager and hubby that nice norelco razor hes been wanting and skip the stores all together.
Whatever you do, keep on pluggin away.