I am in the market for a "new to me" tractor. I'll use it to cut about 80 acres of hay and brush hog. I have always been enamored with the 5410/20 and 5510/20, but honestly only because we have a 5310 and it has been such a good machine. I would like 65-80 hp, nothing newer than 2005-ish and nothing older than 1978-ish.....I know that leaves alot of tractors to look at. I just don't want to buy a tractor and a year later have an issue and someone say "oh yeah!, this model is awful about (....) breaking, how did you not know that. I know that there isn't a perfect machine, but I don't want a model that is prone to any sort of engine failure, like the blocks on the old fords, or head gaskets are prone to fail....I feel like I'm just confusing you at this point. Any help is greatly appreciated.