Hello M,
Welcome to chickens. Over the years I've found that the breeds I thought I wanted (based on everyone else's description) weren't always the breeds that tuned out to be my favorites. In fact, the breed that I wanted the most I found quite undesirable once I obtained them, and a breed that I hadn't considered ordering but obtained as a substitution for something that was in short supply turned out to be my favorite -- a rare breed that I no longer just have, but am now actively breeding with a goal to reach the SOP. So you might want to consider trying 5 or more each of your top 3-4 choices and see how they fit in with your vision of what a chicken should be, and with your management style. You've got some great breeds on your list. I have Speckled Sussex and Buckeye for meat and eggs, and Red Dorkings (the breed I'm trying to improve) for meat, eggs, and brooding. They really brood well, are great mothers, and the culls are amazing meat birds. Of my seven hens, four have already gone broody this year, which is even more impressive considering that I live north of Seattle so the days are very short in the winter compared to Louisiana.
Since you mentioned that you want a well-built chicken but don't care that much about color because you want a utility bird instead of a show bird, it is important to realize that the SOP was written to guide breeders to retain the original utility purpose of the bird. Most people think of a "show bird" and first think about the strive to perfect the color, which is unfortunate. Emphasizing color before conformation, size, vigor, and function have ruined the general population of many breeds, to the point that some breeds have almost no birds that even approach the SOP closely, much less meet those standards. So when you search for sources for your birds, don't necessarily shy away from show quality birds because you "don't care about color." True show quality birds are the total package, which you need to maintain a healthy, vigorous flock that can sustain itself for generations without health issues or recessive genes creeping in to create an unpredictable future. So if possible, buy from the best quality breeder you can find, and just tell them that you'd be glad to take their great quality birds that they're culling because of color. That will give you the best possible utility flock, without concern over appearances.