Here is a spreadsheet I use. It has all of the units listed in two separate sheets. One for cost one for maintenance.
EDIT: You do need microsoft excel or similar product to use this. I believe Open Office would work as well.
See the attached for instructions, this is made for the sql method of mod loading, not xml, but it is pretty simple and lets you change only what you want and makes most of the code for you. I am using it and it works fine so far, you can use these sheets for any table in the game, just change the info in the blue areas of the spreadsheet, they change all of the rows appropriately. Sorry, I don't know how familiar you are with things, so I tried to explain it as best I could if you need more information or anything. Let me know.