When you move the furnace it means moving the main trunk line and return air, no way around it.
I would suggest a 95% efficient gas furnace and heat pump. I do not have a brand preference.
Geothermal heating and cooling is also an option. This will run you about $5000 more than the traditional units and has about a 15 year pay back depending on you states tax credits and incentives for sustainable systems and appliance installations.
Ranges vary widely in style and price. They are not energy hungry appliances pick which one makes you happy.
For more information:
Read "Can you help me select a high efficiency furnace?" a Q&A answered by Richard Parker.