You're making a wise decision by going with RCBS.
It's all I use and they have great customer service if anything ever breaks.
I was seriously considering the Lee. But looking over the Amazon reviews, a number of people said that the powder dispenser (sorry I do not know the correct term) spilled powder. And apparently it spilled more than just a little. Every review I have read about RCBS has been favorable. I also believe that you get what you pay for. I plan on taking a trip to Cabelas, hopefully they will have both units available to try on the floor. But I think my mind is made up, RCBS.