cjeanean, we had the same concerns about cat and chickens when we first got started. I took seriously the warnings I'd read about regarding cats sometimes killing chickens and made sure the two never bumped into each other. We got our first two kitties from a farm family (yeah - free!) who raised chickens, a good start. I still kept them separate, but I started noticing interesting things, like...when Loco, the nuttier & larger of the two cats, came into the coop with me, he'd go up to the inner wall made of fencing and playfully poke his paw at one of our full-grown chickens. They'd respond by jumping towards him and giving a vicious jab with the beak! End of game! (We'd pretend the chicken said, "Here, Kitty, Kitty, Kitty...Make my day!") Those ladies seemed quite capable of taking care of themselves, even eager for Loco to make an attempt. He learned fast.
Finally the day came when I was working outside and suddenly noticed Loco was in the chicken run with the chickens, who were totally ignoring him and scratching around. He was lolling on his side with a jaded look, looking like a bored Roman Emperor. I flew into the run and they all acted like, "What's the big fuss?" After that, I let them spend more time together, especially as we started to free range our "girls". There was never a problem. The cats at that time were completely outdoor cats, except for wintertime. Loco was a great hunter!
Now we have 4 cats, who intermingle with the girls when they're out. At first the two new kitties thought it was a cool game to practice stalking and ambush the hens...that game didn't last long, either! Now I occasionally see a hen chase one of the grown kitties all across the yard! Payback! All of our outdoor cats are hunters, which really keeps our rodent population in check, including things that were decimating our gardens thru winter. For our situation, we let our cats in nights due to predators (coyotes, owls, fishers...you name it), but that's just us.
What age are your chickens? When we have chicks, I make sure the cats can't get to them. By the time the hens are grown, our cats know better than to mess with them, and don't seem interested in that anyway. Other BYC'ers have posted cute pics of cats right in with their little chicks, but that would bear watching. I just haven't tried that.
Personally, it seems like a good idea getting a kitty (or two to keep each other company; works great) and letting it grow up in your setting with chickens. Hope this helps and sets your mind at ease, as we went along the same path.