Brand...
I have not seen that an issue. Look for a good stretchy material, heavy duty zipper, knee pads, good collar.
A full body provides all over protection... scrapes, leechs. Is plenty comfortable. 2/3 ( which means 2 mil on the limbs and 3 mil on the body / chest ) is generally stretchy and easy to put on. That should be plenty good for most KY waters in the summer months. My cement pond is now 66 degrees. Crazy spring. I took my first snorkel of the year yesterday rinsing ticks off after hunting the elusive dry land fish. Bare skinned it. Felt good.
With a 2/3 and a hood you will do fine. I think you could slip on a pair of armour all underwear and maybe improve it for a bit of extra warmth. I do not believe suits have to be so tight as many folks recommend... just snug.
Get a hood for sure. I like a beanie cap so you can hear. Some hoods are real tight and pull over too tight and then you cannot hear... " There is a gator swimming toward you" or other such pertinent info.
Being from KY i dont't know why you can't just do like the Turtle Man. Ive never seen him wear a wetsuit. He just gets in the water in his britches and shirt. Live Action!