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A layout tool is not enough. You need support to make the most out of it. Tanner is powerful but requires a lot of personal involvment to get it "rolling". For Virtuoso you can find many things by just searching the web (even free libraries).
Virtuoso being the tool used throughout, most support for virtuoso. Why dont u try using Laker ? It is a great tool where u can reduce the time to a great extent if u are having a good exposure to the tool.
I have been using Cadence IC 4.46. I use Virtuoso Layout editor for all my requirements for Analog and Mixed Signal custom IC design. Very recently I started using L-Edit from Tanner EDA. But still I prefer Cadence environment.
I have been using Avanti Apollo for a while. Lately I started using IC5 and realized a fact that IC5 is by far more intelligent than any of Avanti/Synopsys tools. It is a joy using IC5. Synopsys seems to be trying hard in Astro tool to make it better but most of the new features they are adding are full of bug and difficult to use.