Yeah...no Splenda, unless your yeast are chubby and need to diet!
I doubt you'll even notice any difference with that 1/2 pound of table sugar. Good move BTW, getting another batch going right away! I think I've had a batch or two bubbling away continuously for the past 2 years. Which reminds me...I'm about ready to keg my last batch, so it's time to pickup some more apple juice!