Pete is the master of understatement by saying some of the weekend renters on the Current "can be noisy and sometimes unrefined." The rest of us use thebob's phrase and call them river dorks.
I agree on the Eleven Point and the Current Rivers as the best Ozark rivers for reliable canoeing any time except in years of extreme drought.
I will add that you can add you can go further down river than Round Springs. Round Springs to Two Rivers is about 18 miles. It would make for a longer day but you will pass Bee Bluff at about halfway, which I highly recommend.
I usually turn it in to an overnight trip and camp across from Bee Bluff. Nothing better than sitting by the river watching the moon rise behind Bee Bluff at night, or watching the rising sun light up the bluff in the morning.