Are these all 150hp O320 engined aircraft? Initially I was comparing the prices to a normal 150 and thought #1 was just a bit high, #2 is too high no matter what, and #3 a reasonable option. If they are all converted 150hp... they're that much better.
#1 seems to me not badly priced, if the avionics are the right kind of average (IMO anyway). Risk is low utilization - make it conditional on a thorough inspection of the camshaft and internal parts (pull a cylinder).
#2 is overpriced - no question. Maybe worth $8, maybe worth nothing.
#3 looks like a good option - is $14K with new cylinders? I'd jump on it if so... Maybe I will!!

(JK... have my hands full already) Even if not - if there's no reason to replace cylinders, just fly it till the engine is tired - then find a used low-time replacement coming off a 172 being upgraded. There are lots of O320s around.
If you see anything in SW Ontario, I'd be happy to look at it for you, and my mechanic is very thorough - he'd do a logbook analysis pretty cheaply and can tell an awful lot just from that, and give an indication as to whether or not it's even worth looking closer at the aircraft. And I'd be happy to ferry it out to at least SK, or all the way!

Just buy me a plane ticket home.
