Shari:
Purchase Quicken 2007 for Lion (now upgraded for Mountain Lion) from the Intuit website for $15:
http://quicken.intuit.com/personal-finance-software/quicken-2007-osx-lion.jsp
This version will run on OS X 10.7.5 and should open your existing Quicken 2006 data file with no conversion necessary. You will probably have to go back and reenter your 2012 data that you had entered into iBank as I do not know of any way to short circuit this step from iBank.
You do not need to upgrade to Mountain Lion for any of this. My attitude is that I will not upgrade to Mt. Lion until there is some reason that requires me to do so, and in my computer usages, that reason has not presented itself. I happily continue to use Lion.