I use the free version of Quickbooks 2009 (Simple Start). It has worked very well for my needs. The ability to do estimates, invoice tracking, etc.
I just set a price for editing hours, videography hours, dvds produced, dvd copies, conversion time, etc and once you plug in the item, it plugs in the price.
As far as budgeting, I haven’t really set any budget as this is just a sideline/parttime business for me. But my tax company loves that I give them the reports from this program at tax time. As far as margin, I know how much my materials cost, so it is easy to figure. There may be a feature in Quickbooks for this, but I just have the free version and I cannot find it on there.
