Sikpupi,
That does sound like overkill. I thought you were looking for an new program that would encompass everything for you.
If you are comfortable programming in a language such as BASIC, you could easily write your own program to do the calculations for you. I am pretty sure you could do the same with an Excel spreadsheet, where you just plug in the date and it calculates the depreciation for you.
Is something like this what you are looking for?
Investment and Business Valuation template
Take Care,
Richard