Heat Pump: replace compressor or get new complete system?
	
	
		On my 10 year old Carrier heat pump, the outside unit is rattling. First tech said it was the fan motor ($700 parts and labor). Second tech brought the fan out but the rattle remained. Put old fan back and said it was actually the compressor ($2200 parts and labor).
First question: If I replace the compressor, can I get 5 more years out of the system? Never had any problems with the rest of the system (indoor or outdoor).
Second question: For a complete new system (seems to be $5000-$6000) is it worth paying $500 more for an R-410 based system over an R-22 system?
Third question: Does Kenmore make a quality heat pump? Sears rep said it uses same main components as Carrier? Or should I stick with Carrier/Trane?
Thanks everyone!
-Tony