Headgasket?

[04 Diesel]

My wifes 92 300D's coolant has been slowly disapering for awhile now, I would have to top it off every once and awhile. Some white smoke out the tail pipe, and now she says it is running alittle hotter than normal. So I plan on replacing the headgasket, timing chain, water pump, thermostat, headbolts, timing chain tensioner, Did I forget something? Also plan on having the head rebuilt.The car has 245,00 miles on it, This is the worst possible time for this to happen, no money!