Brian,
If you have a free hand to make the adjustments with - there is NO substitute for having real drawbars. It adds all the difference in the performance, to be able to make miniscule changes in real time. It's an art all unto itself, and one that is so much fun. Once you have a drawbar organ, it will be tough to go backwards, so good luck. I'm a little jelous. I've had a few over the years, but I just can't devote my left hand to the control of the drawbars. I settle for presets, and deal with it that way. I have a few sounds right next to each other that sound like I'm making drawbar adjustments....sort of. Like Marvin said:
"Ain't nothing like the real thing, baby"