Opinion wanted: Home heating/cooling

[Frankie]

My house was built in the late 60s. I remodeled it about 10 years ago. The original compressor and furnace/AC have worked loyally till now. However there's a refrigerant leak that has drained the entire Freon supply. I met with the tech today and he is of the opinion that I shouldn't put more money into the old system. I'm keeping this house for another 2 years. 3 max. What's the most economical way to approach this problem? Do you guys know of a good brand that does not cost an arm and a leg?