I am going to spend the better part of today building some models in Excel. Much as I love Google Docs, for any serious model I still go back to Excel without regrets. It is fast and versatile and I know it extremely well. I see a fair number of business budgets and financial models built in Excel. Many suffer from the same set of problems:Artificial precision: often there is an attempt to capture every line item down to office supplies – but those generally won’t make or break a business (un...