Okay, just went and looked at the cat 303.5. it's in better shape than the seller was making it out to be. It does have play in the bucket pin but the rest of the boom is nice and tight along with the spin bearing.
only leak I could find is the cylinder for the thumb which just needs to be repacked under the machine and undercarriage is nice and dry.
Maintenance is questionable, he says it's been maintained but it was also low on hydraulic fluid so I have to question that. It's obviously got a very slow leak from that cylinder and has been leaking for quite some time judging by the grime of it so I have to wonder how well it's been taken care of.
I'll throw some pictures up when I get home. It's got 3,500 hours on it and he says he wants about 25k for it.
That's a serious chunk of change. Makes me a little gunshine wonders if I should just rent