I just set up an appointment to replace my 35 yo LuxAire with a new amana! Can't wait to get rid of that old faithful.

Amana is better and more efficient, better design and energy efficient, you will be pleased! good warrenty also!

Apparently the "drip pan" has pin holes, so water is leaking to the basement floor. The heating company said that the air cond is too old for them to order a new one(drip pan, as the old one is metal and new ones are plastic), and that they can replace the condensor, or I can get a new Air conditioner. My question is: Does this sound logical for one, and how much should I stick into an old air conditioner, that has always run fine. And was the furnace, which is Amana compatible with this Coleman air conditioner.

If they are talking about replacing the condensor, you should be looking to replace the whole AC unit. If you can't afford it, start saving now and maybe try cobbling together a means of directing the water into a floor drain for the next couple months (assuming you are only using it seasonally and don't live with it running year round).

If you know how much longer the furnace is supposed to last (and assuming you plan on still living there by then), I would buy a cheaper (or maybe even used) AC unit that will get you to the time when you can invest in replacing everything at once. Right now I don't think it's worth it to replace a relatively new furnace (as it is likely going to last for 25 years if you got it 8 years ago).

Regardless, don't put any more money into repairing the existing AC....that's pointless.