In the "35 spreadsheets" scenario, I have found Quantrix to be the killer app. Very occasionally, Sharepoint and server side Excel is viable, but if you can import cleanly, Quantrix is almost there for claiming small proprietor mindshare. The beauty of anything that is easily understood as more robust logic, in a proprietors view, is the path that opens for you to work on the tricky bits they'd never let you touch otherwise.