I've had my Chase for a while (before it changed to Freedom). That used to be my main card.
Amazon Chase card for Amazon purchases and food (and gas if Chase isn't offering it in their 5% categories).
Last month I got the Amex Blue Cash Preferred. This might seem kinda convoluted, but it's incredibly easy to hit the $6,000/year limit for 6% back on groceries (I buy groceries at Costco or Walmart normally, so my normal food purchases won't fit in this category). I buy $500 Visa gift cards (or Amex gift cards, for Costco) and use those on anything that would normally only get me 1% back. Cell phone bill, food at work, utilities, etc.
The fee for the cards is $5.95, so you lose 1.2% of rewards off the bat, but that means you're still getting 4.8% for purchases where you would normally only get 1% with a normal credit card.
It's somewhat of a pain in the butt, but I figure I'll be through the $6,000 well before a year is over and then I can transition back to normal paying habits. I also use the Amex directly for electronic purchases since they have the extended warranty.
The 3% department store points on it seems to cover Amazon as well, so now I'm not sure what exactly I'll use my Chase Amazon card for except food.
Seems somewhat complicated, but it's really not...I feel like a credit ninja.