Would the 1810/11/12 be in significantly better condition such that a bunch of repairs would not be required?
I'd fix the 1450. Most of the steering can be done with little cost--tighten up the gear box, regrind the follower stud and replace the tie rod ends. Done for under $20.
Then, tackle the mower deck. Find a donor deck, and swap spindles or just use the donor deck--usually avail for under $200.
Rebuild the carb and install a replacement bushing for the throttle shaft. Cost under $20.
Send the relief valves off for a rebuild, I think about $150. there is a company that advertises on ebay. Someone else will post the actual company. or check the technical section.
Run the engine as is, so it smokes a little. Use 40wt oil if you need to.
Deal with the engine, next winter. Should be able to do it for $250 machine shop time and under $200 for a kit.
That's less than half of your original $1500 estimate. I'm not familiar with the CCC tractors, so I can't comment on the value or durability of an 1810, etc. But the 1450 is a very nice tractor and worth the investment, IMO.
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