A new fixed pitch prop is about $7800, but there is no way you will need a new one at overhaul unless you are operating off sand or very rocky ground. You can expect a fixed pitch prop to last 18-20 years.
CASA hasn't implemented SIDs, Textron has. Don't fall for the bull**** that it's optional.
Fuel figures are... odd.
C150 = 23lt/hour = $47.15
PA28= 36/hour = $73.80
Oil consumption depends on condition of course but if you are using more than 1qt per 10 hours you have been sold a lemon.
Engine overhaul figures are highly variable and often include things you weren't planning for. I would suggest a O-200 (Cessna C150) is about $42,000 and the O-360 (PA28) similar or more.
Beware the exchange rate!