The Amazon Visa is pretty great, in my opinion. I don't like keeping track of the rotating programs, so I like the steady 2% on gas/restaurants/drug stores/office suppleis & 1% everywhere else. I really don't use it that much--my daily driver is an American Express--so I don't mind that I'm not exactly "maximizing" rewards.
The Simplicity card isn't the greatest because of its lack of a rewards program. I applied for it to take advantage of the 0% offer--the lack of rewards is being made up by the interest on all that money sitting in my savings account
. I wouldn't recommend it for anyone who doesn't need/plan on using the 0% offer, though.
It seems like you've done a lot of Credit Card applications lately (Discover, Amex BCE, Capital One, and maybe Amazon). You might find that all of those inquiries are what's holding you back. I would wait a few months to let your credit age more and put some distance between you and those inquiries, then apply again. While it'll be 2 years before those inquiries fall off, they're most damaging to your credit in this few months to a year; for all the banks know, you've got new accounts with huge credit limits from those companies that just aren't reporting yet!