derrilex,
Your in Brissy right? You really will see a difference in the cup by upgrading above a rocky. Why don't you have a chat to AM. I know he has a few big commercial grinders up for grabs (well he did last time I saw him). They have bigger burrs, and grinder faster, and you'll notice a difference in the cup over a rocky or a BSG. It will take up a bit of counter space thought, not sure if that's a problem. You can ditch the big hopper on some for a smaller cup. Personally I would avoid the 50mm burr grinders and go bigger if space isn't a problem.
I love my vario because it's small & compact, quiet, easy to use, and clean and I love the fact that it can grind accurately and then swap to a coarse grind in seconds. I haven't seen any second hand ones though, and I've only had mine for about a year. I've seen it compared to the BSG a bit, especially during the hype it put out on other forums, but recently Kelsey had issues grinding lightly roasted beans in his. The vario coped fine with the same beans.
I was also considering the Macap range, and heard good things about them. Also the eureka if space is a premium.