I simply recommend you get a proper manual J and D worked upand crunch the numbers.
If it is a well insulated house you may be fine with a heat pump or you may need a propane unit. Oil prices are pretty volatile, you have certain storage issues and it's generally dirtier than the other options.
Very rarely do I see situations where the costs work out on a geo-thermal unit but you won't really know until you see what it will take for your house.
For more information:
Read "Should I get a heat pump with or without a RCC?" a Q&A answered by Rich Franz-Under.