Donv and Glenn, thanks for taking the time to respond to my query/plea for advice.
I'm talking to the seller for the 500B to procure the logs and history on the aircraft. Hopefully I'll get them before the week is out.
Concerning the 560F, I currently have my mechanic looking through the squawk list from the prebuy and doing a costing to troubleshoot and repair all the major items identified. He has been questioning both the owner and the prebuy mechanic on anything that appears to be ambiguous or questionable (like an annual completed last year that is not signed off)
He will also advise if I should lean toward the 500B and walk away from the 560F.
He is ready to fly out to the have a look over the 560F should we get an nod from the owner. However I am more leaning toward the 500B provided it is flyable, can pass an annual without breaking the bank, and in fair cosmetic condition (no major corrosion issues.
Compression tests done as part of the prebuy and this is what they look like:
LEFT ENGINE COMPRESSIONS
1. 70/80 2. 74/80 3. 76/80 4. 74/80
5. 74/80 6. 73/80 7. 69/80 8. 72/80
RIGHT ENGINE COMPRESSIONS
1. 76/80 2. 67/80 3. 69/80 4. 67.80
5. 71/80 6. 66/80 7. 68/80 8. 70/80
These are some of the issues identified:
1. AD STATUS CURRENT WITH AD 76-12-09R2 DUE
2. ACFT BATTERIES DEAD AND WILL NOT HOLD CHARGE
3. STATIC WICKS NEED TO BE REPLACED, MANY MISSING
4. PAINT CONDITION FAIR.
PAINT COMING OFF CONTROL SURFACES AT TRAILING EDGES
5. ELT HAS CRACKED CASE AND NEEDS REPLACEMENT
6. AUX HYDRAULIC PUMP CYCLING

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7.
GARMIN GPS 430 OLD DATA BASE AND BUTTONS WONT WORK8. JANITROL HEATER WILL NOT LIGHT OFF
9. LEFT AND RIGHT JPI UNITS TRIP CIRCUIT BREAKERS
10. FUEL FLOW INDICATOR DIED DURING ENGINE RUN
Thanks again for your feedback and advice and all duly noted. Will proceed only with due caution and diligence.